The main reason I purchase this property is because I was planning to house-hack.

My concern is whether the city could deny permits for these modifications, such as removing walls or converting a garage, or if they are mainly just concerned with safety and habitability.

Mainly because so many of us on this website are significantly younger than retirement age. 

And it was a nightmare mainly because of HOA politics, rules/regulations, etc especially if you want to make certain renovations to the unit.

She says she notices it in bed and has to put the bed a certain way (like with head on higher part).This doesn't seem to be enough of a problem where any part is unlivable or that requires immediate attention, but the main jist of this post is, where would I start or what type of business or contractor could I start with to find out about this?

Plus, it's become mainly a renter neighborhood as more out-of-state investors poured in.

We were originally targeting a September 2022 completion date, but now it looks like the front house will be completed April 2023 and the main mid-summer 2023 for the DADU."

It is the main form of communication today.

The main floor shown below is roughly 1150 sqft.

Short-term renters generally don't like to stay in Cancun because there's not much to do there and the beaches are mainly occupied by the resorts, against which it's hard to compete and there are much nicer areas in the Riviera Maya.Even though I've owned property in the Riviera Maya for many years and have landed in Cancun many times, I've never been to the city and I've never had the desire to go there.