Yes you could and then when you had a trainwreck of a hunk of wood falling off the fire.............. it wouldn't burn the whole works to the ground....................... I've got personal experiance with that scenario................... 100 pounds of red salmon........... up in smoke with a bleveid propane tank.......................KAPOW!!!!! wood rolled off the rack burned the structure,structure fire melted the hose,hose burned back to the regulator and boom............ fire department put it out.
Great lookin smoker,and I concur that the wheelbarrow don't need any work to get some more out of it.
Could you take the piece of wood out that is making the "floor" and place the "fire box" on the ground inside of the blocks, the rack holding the rocks on the ledge that the wood flood piece is sitting on now and then open up the use of those lower racks if you need?
