A buddy of mine, after just about having a heart attack hauling his through the recent 14" of snow while I cruised along effortlessly, took pictures of mine, bought a pair of used skis off CL on the way home, and had it built the next day. Easy peasy, and a great project for those of us who are becoming age-impaired.
Smitty posted plans to Iceshanty for his initial build - my 2 cents from years of use: make sure to use downhill skis, not cross country, and space the crossbars to fit your individual sled. How do I know this?? Experience lol...