I'm trying to create a trigger that will fire when an opportunity is updated with a checkbox "create_hybrid__c" checked.  The trigger should create a new account record and then update a field on the opportunity with the new account.

I can get the trigger to create the new account, but any criteria that references the opportunity is ignored.  I've highlighted those lines in red below.  Also, I specifically assign a record type in the trigger, but the account is created with a completely different record type.  I also tried to assign a parent account and that criteria was ignored.

Is there any way to modify the trigger below so that all the fields I've specified are populated correctly?  With this trigger, an account is created, the name, agency_id__c, cmr_numer__c, and assign_rpm_client__c are populated correctly, the record type is not correct, and the other fields I specified are just left blank.

trigger CreateHybridAcct on Opportunity (before update) {

List<Account> a = new List<Account>();

for (Opportunity p : Trigger.new){
    if (p.create_hybrid__c == True) {
   
    a.add (new Account(
            name = 'testtrigger',
            agency_id__c = '300',
            cmr_number__c = '997',
            client_name__c = p.account.name,
            hybrid_account__c = p.account.id,
            owner = p.owner,
            recordtypeid = '01270000000UHZcAAO',
            parentid = '0017000000PgOvrAAF',
            assign_rpm_client__c = TRUE
            ));
           
    insert a;
   
    //p.hybrid_account__c = h.id;
    p.create_hybrid__c = false;     
            
    }

}
}