Burk, a few brethren on here have build mini drums from actual drums. You might do a search and get some input from there. Just my opinion, but I think setting it on the ground without somehow sealing it better would allow too much air. The door, the top, are all going to create air leaks I am sure it can be done and would be a whole lot better that what you have now. I am just thinking a mini would be real air intake critical. Keep after it, you can get it done!!
my avatar swiped fatties from the plate....look how sorry he is.
NB Bandera with mods
Weber 22 .5" x 2, 26.75" x 1
UDS x 3
Created "The Great Spam Revelation of 2011."