http://www.wilderness-survival.net/forums/showthread.php?13921-What-Kind-of-Snow-Sled/page2

The photographs were clipped from the web site above and the person who posted them was 
from Vaasa, Finland, so I suspect that he might have a reasonable working knowledge of Pulks.

"You could always DIY from pine and 4mm plywood" (roughly 1/8" plywood)