Technically speaking, YUV (HuffyYUV, to be specific). The only "RGB" aspect was when I used VirtualDub to create the 23.976 IVTC video stream, as well as the video-crawl filter (VD drops into RGB mode to make changes, but the source remains YUV at the end.)
"I do not recall even seeing a side flip or a disc change and from what I saw today"
You won't. Vegas is very good about combining/overlapping video and audio. How do you think I made my Millenium Falcon intro.
BTW, I found my old ESB intro, and I'll send that to Rik also. I got it off one of the Def. Col. LD's, and it kicks ass - and will look even better with this new transfer process."MeBeJedi, how long has this taken you so far and when do you expect to be finished with the whole trilogy?"
Well, it's taken me a year to perfect the process, but technically I can do each film in a week now (I'm including "Darth RealLife" in that equation.
) That being said, even with 700+ GB on my computer, I'm running out of room (total files for ANH alone are 100+GBs), and I wanted to hold onto them for more corrections (glitch removal, anamorphic), so I'm kinda stuck between fixing ANH and staring on ESB. As much as Rik loves the audio/video quality, [Lucas] "I'm still not done with Star Wars" [/Lucas], so it's going to look even better. 
Oh, chances are that I won't include the 5.1 audio in the future. I just wanted Riktor to hear it, since I worked so hard on it (unless, of course, everyone clamors for it.)
Rik and I are hammering out details for an XVID version, to give you guys a taste of what it looks like (but he needs to return my PM.
)