Hey all. I'm having some trouble getting a commandButton to rerender a pageBlockTable which is inside an outputPanel that is always renderered

<apex:page controller="AirlockLookup" lightningStylesheets="true" showHeader="false" sidebar="false">
    <apex:form id="form">
            <apex:pageBlock id="block">
                <apex:pageBlockSection id="section1" columns="1">
                    <h1 style="font-size:18px;text-align:center;">Airlock Model Search</h1>
                </apex:pageBlockSection>
                <apex:pageBlockSection id="section2" columns="2">
                    <apex:inputText id="Make" label="Make" value="{!Make}" title="Leave Blank if Unknown">
                        <apex:actionSupport reRender="section2" event="onchange" />
                    </apex:inputText>
                    <apex:inputText label="OEM" value="{!OEM}" rendered="{!(Make == 'RAS')}" title="Leave Blank if Unknown"/>
                    <apex:inputText label="Series" value="{!Series}" title="Leave Blank if Unknown"/>
                    <apex:inputText label="Model Name" value="{!ModelName}" title="Leave Blank if Unknown"/>
                    <apex:selectList label="Flange Style" value="{!FlangeStyle}" size="1">
                        <apex:selectOption itemLabel="Unknown" itemValue="Unknown" title="Unknown"/>
                        <apex:selectOption itemLabel="Square" itemValue="Square" title="Square"/>
                        <apex:selectOption itemLabel="Round" itemValue="Round" title="Round"/>
                        <apex:selectOption itemLabel="Square Inlet/Round Outlet" itemValue="Square Inlet/Round Outlet" title="Square Inlet/Round Outlet"/>
                        <apex:selectOption itemLabel="Round Inlet/Square Outlet" itemValue="Round Inlet/Square Outlet" title="Round Inlet/Square Outlet"/>
                    </apex:selectList>
                    <apex:selectList label="Endcap Configuration" value="{!ECConfig}" size="1">
                        <apex:selectOption itemLabel="Unknown" itemValue="Unknown" title="Unknown"/>
                        <apex:selectOption itemLabel="Inboard" itemValue="Inboard" title="Inboard" />
                        <apex:selectOption itemLabel="Outboard" itemValue="Outboard" title="Outboard" />
                    </apex:selectList>
                    <apex:selectList label="Product Passage" value="{!ProductPassage}" size="1">
                        <apex:selectOption itemLabel="Unknown" itemValue="Unknown" title="Unknown"/>
                        <apex:selectOption itemLabel="Blow Thru" itemValue="Blow Thru" title="Blow Thru"/>
                        <apex:selectOption itemLabel="Drop Thru" itemValue="Drop Thru" title="Drop Thru"/>
                        <apex:selectOption itemLabel="Jet-Under" itemValue="Jet-Under" title="Jet-Under"/>
                        <apex:selectOption itemLabel="Offset" itemValue="Offset" title="Offset"/>
                    </apex:selectList>
                    <apex:selectList label="Cleaning Options" value="{!CleaningOptions}" size="1">
                        <apex:selectOption itemLabel="None" itemValue="None" title="None"/>
                        <apex:selectOption itemLabel="Quick Clean" itemValue="Quick Clean" title="Quick Clean"/>
                        <apex:selectOption itemLabel="Clean in Place" itemValue="Clean in Place" title="Clean in Place"/>
                    </apex:selectList>
                    <apex:selectList label="Housing Inspection Door?" value="{!HID}" size="1">
                        <apex:selectOption itemLabel="No" itemValue="No" title="No"/>
                        <apex:selectOption itemLabel="Yes" itemValue="Yes" title="Yes"/>
                    </apex:selectList>
                    <apex:selectList label="Steam Water Jacketed Endcaps?" value="{!SWJEndcaps}" size="1">
                        <apex:selectOption itemLabel="No" itemValue="No" title="No"/>
                        <apex:selectOption itemLabel="Yes" itemValue="Yes" title="Yes"/>
                    </apex:selectList>
                    <apex:selectList label="Steam Water Jacketed Housing?" value="{!SWJHousing}" size="1">
                        <apex:selectOption itemLabel="No" itemValue="No" title="No"/>
                        <apex:selectOption itemLabel="Yes" itemValue="Yes" title="Yes"/>
                    </apex:selectList>                    
                    <br/>
                </apex:pageBlockSection>
                <apex:pageBlockSection columns="1">
                    <apex:commandButton title="Search for Models" value="Search" action="{!SearchModels}" reRender="models" status="searchstatus"/>
                    <apex:actionStatus id="searchstatus" >
                        <apex:facet name="start">
                            <div style="position: fixed; top: 0; left: 0; right: 0; bottom: 0; opacity: 0.75; z-index: 1000; background-color: black;">
                                &nbsp;
                            </div>
                            <div style="position: fixed; left: 0; top: 0; bottom: 0; right: 0; z-index: 1001; margin: 30% 50%">
                                <img src="http://upload.wikimedia.org/wikipedia/commons/e/ed/Cursor_Windows_Vista.gif" />
                            </div>
                        </apex:facet>
                    </apex:actionStatus>
                    <apex:outputPanel id="models">
                        <apex:pageBlockTable value="{!models}" var="m" rendered="{!showModels}">
                            <apex:column headerValue="Model Name" value="{!m.Name}" />
                            <apex:column headerValue="Make" value="{!m.Make_Name__c}" />
                        </apex:pageBlockTable>
                    </apex:outputPanel>
                </apex:pageBlockSection>
            </apex:pageBlock>
    </apex:form>
    
</apex:page>

public class AirlockLookup {
    public String Make {get; set;}
    public Boolean showOEM {get; set{showOEM = false;}}
    public String OEM {get; set;} // Only if Make is RAS
    public String Series {get; set;} // Dependent on Make
    public String ModelName {get; set;} // Will need to use a Contains()
    public String FlangeStyle {get; set;} // Square, Round, Square Inlet/Round Outlet, Square Outlet/Round Inlet
    public String ProductPassage {get; set;} // Blow Thru, Drop Thru, Jet-Under, Offset
    public String ECConfig {get; set;} // Inboard, Outboard
    public String CleaningOptions {get; set;} // None, Quick Clean, Clean in Place
    public Decimal HousingHeight {get; set;} 
    public String HID {get; set;} // Housing Inspection Door: Yes, No
    public Decimal AIFlangeID {get; set;}
    public Decimal AIFlangeOD {get; set;}
    public Decimal RIFlangeID {get; set;}
    public Decimal RIFlangeOD {get; set;}
    public Decimal IFlangeID {get; set;}
    public Decimal IFlangeOD {get; set;} // All Decimal fields are 14 left, 4 right
    public Decimal AOFlangeID {get; set;}
    public Decimal AOFlangeOD {get; set;}
    public Decimal ROFlangeID {get; set;}
    public Decimal ROFlangeOD {get; set;}
    public Decimal OFlangeID {get; set;}
    public Decimal OFlangeOD {get; set;}
    public String SWJEndcaps {get; set;} // Steam Water Jacketed Endcaps: Yes, No
    public String SWJHousing {get; set;} // Steam Water Jacketed Housing: Yes, No
    public List<Model__c> models {get; set{models = new List<Model__c>();}}
    public Boolean showModels {get; set{showModels = false;}}
    
	public AirlockLookup() {
        
    }
    
    public PageReference SearchModels() {
        showModels = true;
        models = [SELECT Id, Name, Make_Name__c, OEM_Style__c, Series__c, Flange_Style__c, Product_Passage__c, Endcap_Configuration__c, Cleaning_Options__c, Housing_Height__c,
                 Housing_Inspection_Door__c, Axial_Inlet_Flange_ID__c, Axial_Inlet_Flange_OD__c, Radial_Inlet_Flange_ID__c, Radial_Inlet_Flange_OD__c, Inlet_Flange_ID__c,
                 Inlet_Flange_OD__c, Axial_Outlet_Flange_ID__c, Axial_Outlet_Flange_OD__c, Radial_Outlet_Flange_ID__c, Radial_Outlet_Flange_OD__c, Outlet_Flange_ID__c,
                 Outlet_Flange_OD__c, Steam_Water_Jacketed_Endcaps__c, Steam_Water_Jacketed_Housing__c FROM Model__c WHERE Make_Name__c = :Make];
        		
        return null;
    }
}