I know all about the wear and tear - It's why I have drag brake dialed in the ESC. Seems to work better than constant forward-aft on the trigger. Easier on the drivetrain (especially the outdrives).
The Ofna is a pretty tough chassis, kind of a blend of monster truck (pillow ball front suspension) and on-road. I've bashed it pretty hard, and have yet to see anything break.

I don't think you're likely to see anything at Youtube on Gymkhana soon. It's still being worked out. Just as it is with you and I. Everybody is still starry-eyed about the Traxxas rally, and that being the case, until more do as you and I are doing, it'll be just the same crap being put up now.

I'm considering trying out the JL10e TC from Ofna for Gymkhana, too. It's a shaftie, so I'll be able to do dirt with it. The DF03RA has a few bugs in it still, and needs option parts to work well. The Ofna drift doesn't, and I have had the JL10e TC before, so I know it won't need extra work to Gymkhana, too. It'll be my spring and summer project.