We use Zillow to find finished product in a certain geography, and use TLO to skip trace them and get them on the phone. 

I am finishing up building my own house and am looking to figure out what the next thing is that I can do in my spare time.

The interior paneling was usually a  3/16 inch photo finished veneer very light weight and the exterior siding was aluminum which was also very lightweight.

I just finished estimating 18 unit apartment for a friend, it came out retail at 1.2, that's if he pays for everything, since I would GC and do it for free in exchange for experience, that sheds off 200-300k, that being said, that's a dirt to doorbell.

Not sure if you are guaranteed but I just finished a purchase thru them and good a special warranty deed and title insurance. 

And now, you're left responsible to finish the job?

Check out the BP Ultimate Beginner's Guide and then once you've finished that, read "The Millionaire Real Estate Investor" by Gary Keller and "What Every Real Estate Investor Needs To Know About Cash Flow" by Frank Gallinelli. 

I currently have one I'm finishing up there right now.

Don't show studs, I need the walls in place to better visualize potential finish.

I just finished reading the Millionaire Next Door, It is a great read if you haven't read it already.