What skis to make into sandskis

I use my kastle 215cm gs skis, Long and straight seems to work best. I also used two steel plates bent like a ski tip, a heat gun, and a bunch of c-clamps; to make the ski into a twin tip.
 
what are you putting on the bottom of the skis so they go on sand if you don't mind me asking. I'm interested in making a pair myself

 
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