Welp, You didn’t come here for construction advice like you said. You needed chemistry advice which we certainly can do as well. And as friend-ily as I promised.
So I am around this type house all the time. On the ocean and everything. I’ve literally been in more than I can count. What I always see is that with an owner that didn’t need to spare expenses, the pools are insanely over engineered with 8 pumps and multiple filters. Many will have every gadget and commercial grade device there is. Maybe several. The point to this story is that the 40k SWG unit would work just fine in the states, but may not produce enough chlorine in a hot/Tropical climate. If it’s available I would highly recommend a 60k unit because the sunshine is going to LOVE to burn up your FC in the peak season. If a 60k unit isn’t available, I would have two 40k units installed side by side. It will add $1500(ish) to the project and be a drop in the proverbial bucket. After all, you want it to not only be easy, but worry free chemistry when you aren’t there. It would be the best money you spent.
When you have the time, start your chemistry journy here
ABCs of Pool Water Chemistry. It’s a lot of terms at first but simple stuff and they will click after a few reads. Take some time to process it all and read it again. We are here to answer any questions in the meantime.