Check with most of the "builders" and I think you will find that most of them do not even do their own repairs! It's much harder to do repairs and not cost effective to them. As far as the lay-up, I would much rather have a company that is set up for this and has workers that do it all the time and not a "glass shop" that does many other things. A lamination shop go's thru material faster and has fresher and cleaner stuff to work with. The workers do the same thing day in and day out. They are very good and trained at what they do. And you do have some control of what they do. If it is not right you don't take it!! Bottom line! That falls on the company selling the boat.
Why on earth would you buy a boat from someone who can't lay it to begin with and up and can't fix it when you mash it up?