I agree the CBI theater is lacking. The research alone would be a good challenge as it is a theater that has gone underwritten comparied to the rest of the war.
Would a B-25 as one of the Doolittle radiers count, since the mission ended in China (though not as planned)? Also, would Jap planes as far back as 1931 be allowed (when their little 'war' started with China)?
If this starts in the fall, I could join in on it. Give me some time to consider the theater and what I might want to build.