If you plan to use the live and flip method meaning this would be your primary residence, private/hard money lenders will not (most cannot legally) loan as they would have to comply with Dodd Frank rules and regs.

There is about 5-6 other Airbnbs in this town that I am sure didnt have to comply with fire sprinklers.

Am I legally required to comply with this request?

Hi for the loan amount rule if I potentially have to make an all cash offer to get a deal would it make sense to get Private money then it will comply with the 1031 exchange 'same amount of loan' rule??

What I have seen is formal written notice being issued and if the owner refuses to comply with the rules after that, the HOA simply places a lien on the property.

Perhaps consult an attorney for specifics with complying with the law / filing the forms, but go to court on your own.  

I'm no ADA pro, but I feel like I remember reading in multiple books that landlords HAVE to comply with requests like this (as long as they don't significantly alter the property/structure) but all modifications are at the expense of the tenant.

I’m not sure what changed in regards to the sold prices being shown, but as you pointed out, we are a non disclosure state so my assumption is someone at the state level informed them of that guideline and they complied. 

Permits don't cost that much, so the scope of work must have changed to comply with permits or they bid it wrong in the first place.

Yes, but you need to narrow it down a lot to have a coherent answer.You will have to look at (I'd recommend in this order) the city codes (if it's inside a city, many cities above 50-100k population aren't friendly to development of these), the county codes (most counties are friendly to these, but you will probably have significant issues in major counties like Bexar, Travis, Dallas, Denton, Tarrant, Harris, etc), then you will have to comply with the state-level (TCEQ and others) on the water supply and waste water treatment systems.To put it in perspective again, in say Dallas or Austin, you will likely have prohibitions or very significant hurdles on developing RV or tiny home properties even on unincorporated, "unrestricted," AG-zoned properties at both the city/municipal level and county level.