My senior (kit, remind you) was built about 7-10 years ago. I've not found any variances from the standard build. I'm not totally sure how the ARF's firewall and engine mounting is constructed. My kit plane uses two rails glued in as part of the fuse and doesn't have a flat firewall with the use of a removeable mount. That, I believe is possibly one difference between kit and ARF. Also, I noticed that there was a lot less dihedral on the ARF, but again, the ARF has aileraons planned in whereas the kit doesn't so more dihedral would make sense. I've had to hit the brakes pretty hard in my truck as I was headed home from the field one day and the plane slammed into the front of the bed of my truck. The only thing that happened was one angled brace broke loose on the side of the fuse just in front of the elevator and the covering, brittle with age, cracked in a few spots. Being a tainer by nature, I think that Sig built in a fair measure of strength. I've done some pretty crazy stuff with mine and it keeps coming back for more. It is a pretty good sized plane so giving the firewall a little more strength wouldn't be a bad idea, especially if you're planning on hovering a bunch. Mine will with the OS 91 but it's not responsive enough on the control surfaces for me to feel comfortable enough to do it low on deck. I've seen guys do it but not with my servos!

What engine are you planning on putting in your Kadet?