Check out here: http://www.rcuniverse.com/showthread...0&pagenumber=2 for a list of mods I did to my WM Super Stunt 60.

The aluminum wing tube is 1" dia. and filled with balsa - this is the only AL wing tube I've had so far that is balsa-filled. It just exudes quality. I continue to be very impressed with WM quality overall.

I don't know what engine I will swap in yet. I was thinking about one of my Thunder Tiger Pro 1.20RP rear exhaust engines with a pipe. Then again, I have all these small weedie convesions piling up, it'll be a shame not to go with one of them. May be I'll go with one of my Kioritz 25.4cc on glow fuel. Choices, choices...

I think your RCS 1.40 would be perfect for it powerwise. You might have to be creative with weight distribution to get it to balance correctly, but it shouldn't be too difficult. IMHO, it's a toss-up between the Super Stunt 60 and the newer Fun World 3D. The FW3D may be better appointed, but nothing beats a plain old Stik for lovable simplicity..