Me and a mate knocked on up in a few minutes a while ago. Doddle to do and we welded a but of pipe onto the backing nut then the legs onto the pipe. That way its east to unscrew the nut with the lege off the drum so it fits onto a car boot.
Not sure if its visible in the pic but we threaded three bolts in at 120 degree intervals in the open end so it holds a wok with enough clearance that the flames get out past the wok.
Heats it up quite efficiently I thought. And whilst sitting around it you can get your feet under the fire which is toasty on a cold night.
Even though the spider part on the back of the drum is aluminium its not burnt out yet, and its been pretty hot. The drum is stainless though.