So, at least, now you know the answers to all your questions (number of photos, what to copy, how many copies, etc...). You can get prepared with all the requirements. Good luck ! It will work out well if you have all the documents they request. 👍
I openened one at Bangkok Bank Kao San Road branch in 2014, on a tourist visa. I mentioned that my intention was to retire in Thailand. Took 5 minutes. Needed my passeport and any other official document proving my ID (i had my Swiss divine licence).