Troy, I would think these would be fairly simple to make. But would depend if you have access to a shop really. For the carbon shafts, head to your locl outiftters and get some carbon arrows, cut them to the length you want. You can then machine the 2 ends out of aluminum (or whatever material you want). Bond the parts with JB Weld (cheap option) or see the ice axe article - 3M DP 420 (expensive, but extremely strong).
If you don't have the option of machining the parts, you would have to find parts that fit the shaft. Nothing really comes to mind....browse a junk shop for stuff.