Not trying to make trouble , I have no knowledge of both parties, just saying. Some builders (usually first time builders and I do not know the status of yours) , don't know if what they have done is correct or not. Not knowing the difference one would think they did an excellent job. If you don't know the difference (you said this was the first time for you) how will you tell. As posted above, find someone local to the project (to save you on cost) to go with you. You will not regret it. I'm sure it will be a great kit and you will love it. Hey what do I know I'm a repeat offender and I've got bloopers .