(Note it is often possible to get temporary permits to live in an RV for multiple months to a year or more while building or remodeling (adding solar?).   

The HELOC may be useful for temporary financing like an acquisition and rehab then you would want to pay down or off with permanent financing that would be fixed or at least fixed for a certain period of time.  

@Thomas S.Wow.Sure, sometimes we have to make temporary sacrifices, but to go so far as to say:“Work is not intended to be enjoyed.

Often they've been replaced by temporary (adjustable) lally columns. 

I found out i should first apply for my temporary residency papers first, then purchace since this is the plan.

It's important they are articulate and proficient in English so I'm expecting to pay significantly more than someone off-shore.  

The numbers seemed to work out so we proceeded.We ended up having to build temporary walls to hold up the roof structure, being that it was the only thing left that hadn't been reached by the termites... 

There was a temporary program that ended with bids excepted by  7/31

In the Daytona Beach Shores area, it is the HOA's not the city that has implemented the min. stays and from what I could tell, these 30-90 day min. requirements have been around well before Air B&B and VRBO combined ever existed. 

Regardless of the temporary cause if they did it once they will do it again.