The deals seem to cash flow 7-12% in the holding period and then pop at the end for double or more on the money invested.

Sounds like you asked about an assignment, but instead are trying to do a double close?

Master bedroom had a low points ranging from -0.7" to -3.5""The house has experienced settling of the foundation""It is my opinion that the foundation remains structurally sound and re-leveling is not required at this time.During our inspection of the home we came across the following:Noticeable sloping when walking around.Buckling hardwood floors in the master bedroomCracked and delaminated tile in the master bathroomCracked bricks and mortar joints on the exteriorHome inspector said there is definitely evidence of foundation movementPermapier came out to provide a free estimate and evaluation and suggested multiple piers along master bedroom as well as some other areas of the home. 

Depending on the size of the house - some say buy stuff on Craigslist, but my houses are large (6-7 bedrooms) so that was not an option, I would spend weeks looking.

Looking for 2-3 bedroom, 1+ bathroom in Oakland County, Michigan only.

If you leveraged your 20% down to purchase 2 properties for each one property you did purchase, you would have experienced the same ROI as I calculated (the ROI based on 10% down) but because your investment was doubled your profit would have been doubled. 

I want to make sure it had the minimum sq ft to be able to count the bedroom in the description of the listing.

Besides 21st mortgage any lenders who loan on double moved double wides in FL?

As far as the basements are concerned, make sure you can put bedrooms down there first.

If he chooses to sell he will surely double his investment, unless he used a hml (in which case he'd make more).