Charcoal barrel smoker WFO design - is it viable?

[Hasan]

So basically i want to see if this is usable

so i bought a barrel drum smoker for 40 bucks on clist, then i removed the legs, filled it with 6 inches of loose vermiculite under the firebrick hearth, then placed the entire barrel on top of a concrete base i made.

i have yet to do the final stage which is insulate it with vermicrete

- so.... before i make this final step, i still have the option of making a traditional dome (though more expensive and more work)
if im good with this design id really like to leave it the way it is

barrel length is 29
barrel width is 19
dome height is 14
opening height is 8
opening width is 16

is it viable?
are there any modifications i can make before it becomes permanent?

[Hasan]

these are the updated pics, and the first pizza i made today