I bought a car once that had been built by a local chassis builder. Everyone I talked to raved about the guy's work. The car I bought was a pile of crap and almost all of his work had to be cut out and redone. So I'm not sure what to say other than I guess it happens. Maybe the chassis guy knew it was a long term project so he just cut some corners on it. At this point you'll just have to double check everything. Nothing else you can do.