My father and I flew a couple CG Cubs off skis for many years along with another high wing what used to be a trainer airplane in the tri gear config, it is an absolute blast!! Cubs fly great on skis, father had a full scale cub on floats/skis/wheels hence the idea to do it with RC ones. We made our skis out of laminated 1/32" lite ply that we wet formed before we laminated, then clamped them together with epoxy between the layers, sand perfect, couple coats of clear urethane over the wood to seal and go. Made a small triangular block out of hardwood to mount on the axle and epoxied it to the top of the ski. We then glued a Dubro "wingtip guard" on the bottom of each (like a small fin) centered towards the rear for directional stability and steering. Works great, have 3 sets for 3 planes.

Brian