NON-O Family Extension Question - Lump sum method - Chaeng Whattana

Hi Todd and all, please confirm or correct me if I’m wrong:

I deposit 400k lump sum to bank account 3 month before extension application.

Must get bank statement for account one day before application.

The best bank to deposit is Bangkok Bank, especially because they have branch in Immigration Building basement.

I must keep the sum in account until get final stamp on 2nd visit to immigration. Then I may use funds.

Thanks