First, I had a sample stress-ball potato sent out. It's too heavy and I can't drill out for an engine mount tube like I do for the Sputnik kit.
These new spuds weigh only 18 grams each, half of what the stress ball potato did.
That leads me to believe these might be Styrofoam.
An order has been made for the first six. They've got to coming from China. The delivery estimate date is Thursday, October 23, 2014 - Monday, November 10, 2014!
Another typical day of research at the Odd'l Rockets workshop.