I'd think it'd be cool! Might have to have it hot-tanked to remove the 15 or so coats of paint, no doubt half of which are lead based. Repaint with the hi-temp stuff.
Dunno how large the removal door is on those, but you'd want complete access to the racks- Might need to remove and hinge the entire "square" front portion. Would need a plate/waterpan setup, and perhaps a slide in firebox below.
Man that would look neat with smoke drifting out the letterdrop slot!