Hi John, and welcome to the BrickWood forum!
I’m sure that someone has done something along those lines. The main issues to address are a stable base that can bear a heavy load, and a safe configuration that doesn’t get the heat and smoke too close to your face. Have you tried searching through the forum? (The search here is very good.) I’d look for “custom box” or similar terms.
Of course, the best thing would be if one of our intrepid BrickWood Box builders were to see this post and respond. As one example take a look at this:
(I know it’s a fireplace combined with an oven, but the photos will give you an idea of the kind of support that’s needed.)
Welcome, and let’s talk this out into a plan!