I didn't even do that. Bit of fast talking and they literally trip over themselves trying to sign you up. If it doesn't work in the first bank go to another. FYI I did mine at Krungsri Sai Yuan Phuket. Make sure your clothes are immaculate, shave and generally carry yourself as if your shit doesn't stink. A gold ring on the finger doesn't go astray either. Walk in in shorts and singlet you wont get far at all.
But this is what this site is for. Saves a trip into the bank etc. I bet you still go into a bank and deposit 6 bucks of coin and ask for a printed statement.
Just do what I did. Walk into a branch. Take your passport with you. Tell them you have sold your property in *insert home country* and you are going to buy a cond here. You wish to transfer 5 million baht into the bank account sometime in the next 2 weeks. You haven't found a condo yet but you want to be ready and all set up to purchase one when you do hence the need for a Thai bank account. Mention you will also be interested in the banks insurances as well but you will cross that bridge when you come to it.