@Gary *********
Well I'm based in CM and have recently had to jump through the hoops to get my non-o visa based on marriage.. so needed a bank account to season my funds.. i discovered that Bangkok bank was the only bank that would open an account for me.. every other bank said they were not opening accounts for foreigners any more.. unless you already held a long term visa that is.. and even then Bkk bank demanded a letter from immigration confirming my residence (address) in Thailand and a copy of the marriage certificate, tm30, amphur registration, and my yellow book.. the latter only because i mentioned i had one.. if you're applying for marriage based visa then would advise you to focus on getting a yellow book.. it's basically a tabiaan baan for a foreigner living with Thai wife.. since this has unlocked many doors for me and made dealing with any Thai authority a million times easier.. such as applying for a driving license and a Thai ID card.. sometimes referred to as your pink ID.. and it will also smooth any future applications to immigration.. hope that's useful