Why not do the application online at home they sent the visa to your email. Takes 10 days and 120 dollars, don't use an agent do it yourself in khon kaen to get retirement visa and is easy. I just completed it cost 1000 baht
Bangkok bank needs a copy of translated passport page stamped at your embassy then translated you also need a letter from immigration once you have a certificate of residency the letter is okay ing the bank to open a bank account I recently did this