Drill some intake air holes in the bottom.
Drill some exhaust air holes in the lid.
Put in 3 bolts to hold a rack
Rig (or buy) up some kind of charcoal basket.
Valve on intake
Beer Bottle Opener.
My next one will be a 30g for a neighbor that just want to cook a pork butt or a brisket now and then. I'll try and use a Smokey Joe lid so I can put the rack at the tippy-top.