Guys,
I hold Indian passport and can get VOA for 15 days for Thailand, by filling out the form and paying the fee. I am planning a trip to BKK in December for about a week. I also want to make it Siem Riep (Angkor) in Cambodia (+ 3days). There is an "eVisa" facility run by Cambodian consular site, which I can avail before entering Cambodia. I will be holding a return ticket India-BKK-India. Everything looks fine so far.
However, my below questions remain unclarified even after searching this forum and Thaivisa.com. Please help:
1. If I enter on VOA to Thailand and say exit it at Poipet crossing, can I re-enter Thailand on the same Visa or do I need to apply for a new VOA altogether again (with fee, photo and form)? Will they process VOAs at Poipet crossing. I need to re-enter Thailand to catch my return flight back home.
2. Say, I buy a return trip from BKK to REP or PNH while in BKK on an LCC, and time it so that the return leg (REP-BKK) coincides with my Indian flight back home. Do I need to pass through Immigration again at new BKK airport to check in for my India flight (on TG) when I arrive from REP?
Please help

, thanks!