says, the downloaded instructions are quite clear and seemingly backed up in his phone call. I have a couple of weeks until my postal submission deadline, so I'll hang fire until I hear more from you guys.
I've just completed, and paid for my O-A. Screen says 'Please stay on this page. It may take a few minutes'. It's been like that for about 15-20 mins now. How long did you have to wait for the receipt?
Final comment. I've just answered my own query. Where the layover is more than 6 hours, you are considered a domestic passenger and depart the country in BKK. Therefore, my original question does not arise. I have booked a hotel in BKK. Re-entry permit is not affected, although I understand it will cost 200 baht more than in Chiang Mai.