The front half of the cannon is turned down. Basically it was just long boring work. Something I found out along the way, USE THE LARGEST DIAMETER SPINDLE AS YOU CAN. There were some vibration issues and "flop" at higher speeds, due to the length of the rod as well as it's thin 3/8" diameter. 1/2" would probably have been better, 3/4" better still. I think that's as thick as I could do without boring the headstock on the lathe out.
A little bit further along in the process. No, no action photos since I only have two hands. Another thing I realized is that I should have only used epoxy to the smallest diameter of the foam...that is, it doesn't shape as well with file cards so you'll have to use the file on it. If less is used in the only the center you can turn it quicker.
A close up of the end. if you look closely at the seams between the discs you can see they're raised, the result of the epoxy. 
Here's some of the tools used, as well as a huge mess.More to come...
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