[ODE] Barrel of Monkeys

[Eric Buchanan]

I'm trying to simulate a variety of objects rolling down hill. One of the 
objects is a Barrel (think Donkey Kong, or a cylinder that is fatter in the 
middle than at the ends). 

Tri-Meshes are out because I'm using dTerrain, and last i checked they dont 
collide nice. So my first instinct is to make it from several cylinders  all 
with the same center, each one shorter and fatter than the last to 
approximate the shape and split the mass between them evenly. 

Anyone else have any bright ideas (Monkey Optional)?