PR Document (in Thai) including description, map and an aerial view are here (pdf):
AC Hotel by Marriott Hua-Hin Cha-Am
It will be located on a vast and long empty lot just a few hundred meters north of the Raya Resort and stretch between Naratip Rd and Chao Lai road.
AC Hotel By Marriott To Be Built In South Cha Am
Re: AC Hotel By Marriott To Be Built In South Cha Am
Interesting. I'll definitely try it out if it ever gets built.