This would be a strictly appreciation play.

Have them modify the rental agreement to reflect the time and specify the strict timeline. 

Main question is how long until I could refi and are there strict requirements on this?

Nobody to negotiate with, and it's not as strict as the FHA.After getting this news, the lender basically blamed the appraisal.

Here in CA, the laws are very strict on it and only the licensed can handle it.As others stated, sounds like you have a great opportunity here and no reason to remove the siding, though it should not cost $30k if you did.

Strictly looking for feedback, not offering services or deals.

Having had many calls with people who swear that they strictly buy off-market, I would argue that they may be missing out.

Also, wholesalers, when licensed, are subject to strict agency laws. 

Places like California have some very strict laws about contacting homeowners in foreclosure.

We usually give one chance if they communicated why it was delayed without a late charge but after that we strictly enforce the $50 fee for anything 5 days late