They did state no more open houses.

Also, the rules changed with VA where there is no more cap. 

The selling agent said he never agree to inspections even with cash- unless it is for information only purposes or there is a limit like "no more than a $590 dollar credit for repairs"Is that normal?

Again, no way to prove he actually collected any rents written down on paper.This question is no more possible to answer than "what is the meaning of life?".

In our case, there are no more than 5 people working there at the same time.

No more PMI which may or may not be the case here3.

From what I could observe, the bathrooms could use a face lift (Hopefully no more than $3k each) and the tiny kitchen could have flooring, backsplash, countertop, and new appliance change.

No more flickering lights.

My issue is this: the cabins are no more than 500 square feet each and will include 1 acre of land. 

Buying a 3-4 unit will help you lower your monthly expenses as you'll pay no more rent and get a lot of depreciation/tax deductions while building wealth as the moment you become a landlord the IRS sees you as a small business.