Hi - I can answer some as follows:
1) Orient Thai now trading as 1-2-go
http://www.fly12go.com/en/about_us/fleet_info.shtml
2) I wouldn't touch Phuket Air with a bargepole. While they had those problems in Europe, they were in total denial about the whole thing. Not even sure they are still flying. Haven't seen one of their birds around for a while. Last I saw, there were a few of them laid up at Uthapao.
3) No, L1011 Tristar.
4) Nok Air (loco subsidiary of TG - 737s and ATR), Thai Air Asia, (linked to Air Asia, but run seperately - 737s), PB Air (Embraer ERJ), Bangkok Airways (B717, A320)
5) 1-2-go have chartered to Europe.
6) 1-2-go has one 757. Nobody I know uses 767 around here. Nearest ones I know would be some of the Chinese carriers.