This is a small town and there really aren't any good comps in the historic district.

This service is typically used for bandit sign numbers because they aren't traceable.

Even areas that we deemed safe aren't anymore.

The short answer is yes utilize a heloq if the numbers work.I would get the heloq to have available but use your cash for now do you aren't paying 8% or so for the heloq money.Then if you need cash you can tap the heloq only then.This will save you a lot on interest.You can't deduct the interest on upgrades to your primary residence until it becomes an investment property.

They aren’t going to pay rent for 9 months after their house is finished. 

Whenever we aren’t doing events, the plan is to run it as a campground on Hipcamp.

If you are looking to get or already have a good amount of units that maybe aren't so centralized; it definitely couldn't hurt to look into getting a PM company. 

But the reality is that the majority of stable, SUCCESSFULLY self-employed entrepreneurs will do pretty much anything to own their own house, and the ones that aren't financially capable of doing so yet will understand the income-verification problem quickly.

First it's a very old house (1893) and some of the outlets aren't grounded correctly.

IRS will think you are just pocketing the money and you will get an audit.IRS Audits aren't random.