@Paul *********
then there is a good chance that you will not be asked for a TM30 when you go to Chaengwattana and apply in counter J for a 30 day extension from your 60 day tourist visa entry stamp
BUT
The upside is, believe me you're far from the first foreigner to stay at the Nana, tell the staff you need proof of the TM30 and they'll print off the receipt for you