The commercial guy will help you package the deal But forewarning.

I wouldn't say you "can't stick with a job" when packaging this for underwriting, I'd say you're a self employed contract construction worker, which is a legit business, and incidentally from what you've said it's the truth to boot.

There have been incidents of new apartment buildings partially collapsing because the developer decided to maximize profits and skimp on the materials. 

Rental income is always passive income and never subject to SE tax even if you materially participate.If you are completely shutting off your schedule C business, than you would not report anything in schedule C.

I would recommend getting a bridge loan where the lender will wrap the renovation into the loan that will save you some money there.If you need help putting together a financial package with underwriting (example on my website), please let me know as I have helped many investors free of charge.

I’m looking for cheaper materials to use on low-end rent-ready rehabs.

Hi Basit,She's looking for some books or training only to do tax returns involving rental properties, anything good material you recommend?

We partner with one contractor/team and tend to try to take advantage of economies of scale with materials, equipment etc.

I would be open to sharing some of my materials, but until they work, precious few would be interested.  

@Peter CoglianoA CRM package is best.