My question is, is it worth rehabbing to get it up to code to attract handicapped buyers?

What kind of neighborhood is this (zip-code, A/B/C/D-class)?

I've also used this Federal Housing site which has great data on a county, state, and zip code level:https://www.fhfa.gov/PolicyPro...

Brandon will give a discount code for Pro

Why not forward neighborhoods with color coded priorities and as much helpful info as a package so that before wasting a lot of time going back and forth over the phone, the investor will spend time learning what you have out together and call as a informed buyer.

Chose to start with Arkansas for right now, next was which zip codes are best/good and found 72712- 72034- 72701 etc.

More details below:https://www.fanniemae.com/content/guide/selling/b2/2/03.html

That's your risk profile for legal recourse and recovery.As far as any risk profile that you will have for blight violations or quasi-criminal proceedings like property code regulations, you won't be as protected as an individual as you would be in a business entity structure. 

What are the difference in building codes and what do you need to change?

Enter the code:  EOZVKXKX at checkout for the discount.