Yes, he should do exactly that...not necessarily 200 units; something a little more palatable. If he has his badges and is transparent with them, why not? cash-flow, well we do not know his current situation, and the house builders are flexible on payment terms sometimes, could be weekly payments for instance (again this is from experience) but we should not try and quell this type of enthusiasm, it is kind of a sink of swim scenario.
As for the labour side of things, pick up the phone have a few subbies on stand by, agree the rates, sign necessary NDAs and give them a try.
Going back to the house builders, building several businesses from scratch, I have tried to go into the SME customer base and it is not easy working from a blank page, but working on what I call the Walking Dead philosophy, is that you "Go for head and the body will fall".
What this basically means, the big companies (corporates or otherwise) are the head and the body is the SME market. You get even a small job you can invoice these corporates for and you have a client. That client (irrespective of the size of the job) = credibility. With that credibility, you access the SME market with a far greater degree of confidence.
On a separate note, I think he should try Symphony Kitchens - they are always looking for carpenters/joiners