differ in other places. Do it as soon as possible, it's easy that something is missing and you need to come back. So do it as soon as money is transferred. Etc
I always wondered why immigration offices don't have a room where in entry you "exit" the country, and then enter immigration ;-) (for a "fee")
Come to tuck about it, it's almost what airports are. However, to enter the international airport you need to check-in. And to enter you may need to show your boarding pass.
Why not just go somewhere for a few days and have a mini vacation?
I'm not sure what the bankboom is for. It didn't contain all transactions, bangkok bank condenses several transactions to one... So it's no good evidence at immigration. Need to print 12 months account history! It takes several days....