This is a pretty ingenious idea, so i gotta hand it to you, even if all didn't go smoothly, and I think you harvested too soon.

Why not raise the garbage can off the ground - they make carts with wheels for these things - and then air cool it pulling off the top into a carbon filter? I can't think of a way to seal the lid to the light, but if the only air intake is in the bottom of the tube, it may not matter much...

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"If a law is unjust, a man is not only right to disobey it, he is obligated to do so." - Thomas Jefferson my grow