I've seen home made versions of them...you're right they are spendy. I was going to make on until i realized pizzas on the UDS are great! Use your UDS if you haven't, don't put any smoking wood in only charcoal. You don't need any pizza stone go directly on the great because the heat is perfect coming up from the charcoal basket... you can cook about any temp on it, 250-400 and it turns out the same.
Mini WSM uds style, Jumbo Mini WSM aka Jimmy, newly renovated Big Poppa Black powder coated UDS, Kettle, Potbelly Stove Smoker Smoke house w/ Smoke Daddy cold smoke generator attached.PitmasterIQ,Guru PartyQ ...Keith