Opened with Kasikorn in Big C Nakhon Phanom a couple of weeks ago. Passport, Non-Imm O visa, foreign marriage certificate translated and legalized, yellow book (we own our own home), wife's blue book and ID card. Think that was about it. If you're renting take your rental agreement, residency certificate. If you have a Thai driver licence that'll help. The more you can bombard them with the better, they'll likely photocopy everything you offer whether they need it or not. Not much else you can do really short of using an agent if you're in one of the main areas.
Seems a bit back to front in that they went ahead and finalized their plans then asked if they're doing it right. Logic would suggest you do your research, come up with a proposed plan and then by all means run it by the group. I wish them luck.
You need to wait and check what the current requirements are when you are planning to move here. Nobody knows what will change or still be valid a few years down the track.
Wife and I actually did this yesterday. Took 30 minutes at the office to complete the process with two witnesses. Phone call this afternoon, go in tomorrow afternoon for ID photo and pick everything up...yellow book, kor ror 22 and card. Nakhon Phanom District Office.