At last count I have 4 of those light weight insulated steel pizza ovens which work fine .. the original being the Bakerstone. All of them use a pizza stone, and the fire has to be kept going in order for them to work correctly. Some of them even have little rocket stoves attached!
However, I have yet to see anyone build successfully a domestic pizza oven that uses a brick floor that is heated by the exhaust gases of a rocket stove. If someone has a link, I'd love to see it.