Okay, I have never made a hurricane candle, but I do have a suggestion. Couldn't you just get a 10 inch diameter container from the restaurant supply, like Pam W suggested, pour your base and let it set up, then take another container that is 9" and turn it upside down in the center of the 10" mold, put a weight on it and pour in between the 2 molds? That would give you a hurricane with 1/2" walls all around. You would have to make sure that the inner container didn't have a lip of any kind, but "theoretically" it should work. There is probably a reason why this wouldn't work and I'm sure someone has tried it, but it is just a suggestion. As far as getting the wax out if you pour 15 pounds at once, maybe you could use a siphoning pump? The cooling wax shouldn't hurt the plastic, it is fairly high temp. They only cost about 6 bucks at Auto Zone. You use them to empty a gas tank.