The fact that they don't have critical thinking skills and limited income/saving, makes them desperate and easy target.

You are wise to limit your scope to a particular type of company.I have been in the industry for the past two decades, and from my years in the business, I can recommend a couple of other companies outside of my family. 

We just discovered a crack in the concrete slab foundation that is a borderline major problem:- It is a vertical crack about 1/8 inch wide that is at least 9ft long, which is causing a 3/4 inch drop in the flooring and some evidence of old (luckily) limited moisture and termite intrusion. - BUT, it also appears old and probably a symptom of the original house settling.

Keep your chin up and try to limit contact with your lawyer to dealing with actual issues with opposing counsel.

The only way that works is if they have fully connected utilities and it is sitting on some kind of foundation and not on a trailer.Some folks think they are cool, but you really limit yourself on demographics.

Limited partners usually cannot coattail REP status.

Or should I consider withdrawing smaller amounts, like $100k?

However, I'm not sure how to do that with limited funds saved up. 

By way of example, a lender may charge retainage, only release soft costs upon C/O, may limit loans to a set number of draws or only allow draws once a certain dollar amount of work has been completed.

It's outside Scottsdale city limits (Maricopa County jurisdiction) so it is not subject to Scottsdale's restrictions.It does, however, have a shared well agreement with one other parcel (as almost all in this area seem to).