I didn't have time to make the core blanks, so I went to Home Depot and got a piece of 1"x12"x6' board of poplar. The wide boards at HD are not one piece of solid wood, but made out of 2" laminations. I ripped the board in half which gave me 2 cores. It worked pretty well and is a quick and easy way of getting core blanks. The poplar is pretty light, compared to maple or birch.
The Spacepants:


Assymetrical sidecut: 32m inside, 22m outside radius
cnc cut the circles on the bases. It took a little sanding to get them to fit perfectly, but I'm pretty happy at the way they turned out.
poplar core, uhmw tipspacers, poplar sidewalls
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poplar core, uhmw tipspacers, poplar sidewalls.
a few more pics here:
http://www.skibuilders.com/cpg/thumbnails.php?album=13