Many new materials are not readily available here on Cozumel but they can be ordered or purchased on the mainland and many of the builders are not familiar with these new products, you need to bring pictures and show them what you want, this may mean shopping trips to Cancun or even Merida to get what you want. I, and I know of others who have done this. I did it to get the sinks, tub and shower manifold I wanted. I carried in all of my 12-2 and 10-2 Romex and all my boxes and outlets, had my builder put in the outlets where and how I wanted them, the same thing things applied to my breakers, water heater on solo breaker, same for the AC, bath room and bedroom overhead and wall outlets on the own circuit. Most things are easier to get now than when I build my second story.
Before building I would check out this upcoming expo: http://deconarq.com/...informacion.php