I am getting ready to close on my first investment property and came across having to purchase 2 types of insurance in order to close on my funding from a fix and flip Line of Credit product. 

I have had professional inspectors(General home, under slab plumbing camera/and termite) come and they did not find any major problems.

SFR portfolios are not a product with huge demand, may as well sell them off one by one.

If you feel that the overall mix of security and income production of a rental property will outperform what your IRA is generating today in conventional assets, then it is a good move. 

Part of me thinks a cheap solution could be skim coating the wood with some form of product to get it a bit smoother and then paint with a lower sheen.

Think roof, siding, major systems like HVAC, etc.

To answer your question, an institutional investor and a major lending institution payed us (my company) $100 to $200 depending on the size of the rehab, scope and type building.

No FHA will be reasonably consistent as will most other loan products, the only thing you can expect to vary from lender to lender will be their fees and possibly the interest rate (but usually not by much). 

Another lender I know of just came out with a similar product.

While it wouldn’t be a long term solution it would allow you to get started and cover the majority of your monthly mortgage / living expenses.