This is probably why 24fps works best...

Film uses 24fps, and more recently, 48fps and even higher. Timecode in theatrical films is different and very simple — it counts every frame from number 1 to the total number of frames in the movie.

I'm keeping my eyes open over @ the 35mm Forum in case a set of the SE Trilogy shows up because that would ultimately be the best source for this entire project. PROPS to any and all projects being able to make use of these DTS scores....I think it is a testament to this place that such work can even be done. OT.com RULES!!! :) :)

Here is this info if it helps......

ANH

Six reels
125 minutes

TESB

Six reels
127 minutes

ROTJ

Seven reels
136 minutes

Movies were Scope(2.39:1).

For DTS audio synching, I'd guess we could use the time of each reel to figure out fairly accurately which frame each one ends on. Just a thought.