Yeah i have seen many pics of skis made from smaller hides or sections. Found this quote from a article on competion skiing.
"When moving uphill, the coarse fibers of the fur dig into the snow, allowing the skiers to gain the necessary purchase, but they flatten down and become slick during a descent. “The fur has to come from the forelegs of horses because the hairs are long and thick. That makes the skis fast and durable,” said Sengelite, "
I am assuming the importance on hide characteristics will be dependent on the terrain you will be skiing but over all use what you can get.
but I think the ones i seen simply tied on might have been raw hides …come spring you could use the hides for something else.(?)
and I noticed their sleds have hides the …looked like yak maybe.