I can't comment as to whether there were factory skiis - the niagara area where the lazair was conceived had lots of snow though....
I grew up in north bay with the Nipissing Lazairheads, and each lazair out there (about 10) had a different set of skiis. My old man went through about 5 designs before settling on his final design.
There are really only a few concerns with ski design:
- width of ski
- mounting to wheel or axle
- method of preventing the ski from tipping during flight
Tyler