@Richard **********
exactly what I done immigration at sisaket very helpful,by all means use an agent if you need BUT RUN A MILE FROM ANY THAT TELL YOU YOU DONT NEED 800K IN THE BANK THEY CAN STILL GET IT
Y E S YOU DO IT IS A CLEAR REQUIREMENT OF YOUR EXTENSION OF STAY
The visa WILL be legal but how you get it without money in the bank is not so the visa will not be vslid