Talk to your local inspectors, they are great for this type of thing. They may know the builder, know his track record, and may know other trades who have done work for him before.
And it's free...
Capital? Look into business credit lines from your bank, use what you need and pay it off...
Don't start pulling wires in walls until the plumber is completely done, same with HVAC. Same with the framers, otherwise you may be installing and uninstalling/moving wires because of them, make sure this is known to the builder first.....
Dnk...
