One more thought.
Make sure you document everything before and during the renovation process. This means keeping detailed records on bids, notes of phone calls, letters, and take THOUSANDS of photos before and during the process. Of every room , from different perspectives.. of the yard, of the exeterior.. the roof, attic. Climb around and document everything. Don't just assume your home inspector has your back. They may, but then they may have just not given a damn that day. Take pictures until your fingers bleed. Save them. You will thank yourself later.
Make sure whatever consultant and contractor understands your intent to be involved in the process (in terms of being on site to photograph and inspect). If either raises concerns, DO NOT HIRE THEM.
One other thing -- on your paper that outlines what work is to be done.. this document is prepared by the 203k consultant in conjuction with the builder. Beware -- it will be intentionally worded as vaguely as possible to prevent you from holding either of them accountable. Look for phrasing like "replace deck on back of house". No details on what materials are used, how tall, what size footings, finishing, ect. This way when they build a deck to sub industry standards using non-pressure treated wood they can point back at the contract and say see, we did exactly what the contract says (replace deck on back of house). Just as an example. Be creative.. imagine how you can get thrown over a barrel and visualize it happening. Protect yourself by demanding specifics on everything.
And again - document everything. If possible record phone calls. Sign up for YouMail and save any voicemails left. Save text messages. And most importantly photograph everything over and over as the work is done.
You'll thank yourself later.