we boiled on a cinder arch in a Shelter Logic car tent.
My suggestion - worry less about the pan gaskets and figure out a way to at least vent the gases from the arch.
We filled the cinder blocks with sand- that stopped alot of combustion gas.
Also used the gasket, foil, sand combo to ensure the 6" stovepipe would carry away the exhaust gases.
sand, foil, sand is a good season long gasket- and easy to clean-up