Originally, flue-curing was just a gradual heating method. It evolved into a specific, timed process. Fire-curing is still performed as a gradual heating method, albeit with smoke. So you can do flue-curing or fire-curing, but not both at the same time.
Fires from sawdust tend to smolder for days. When I put wood chips into a slightly punctured foil container, heated over charcoal, it usually consumes the wood chips over a few hours. Then the wood chips, as well as the tiny charcoal fire need to be restarted.
If you want to fire-cure, any old container will work, so long as the fire can be kept low, and away from the leaf (to avoid overheating or combustion of the leaf), and the smoke can be reasonably contained. How much smoking, or how long you carry it out is a matter of taste.
I would suggest building something, and giving the leaf a week in the smoker at low temps (like smoking a Gouda). Fire it as often as needed or convenient. Then see what you get. It's all a trial and error process.
My simple approach was to drill a number of large holes in the bottom of a galvanized steel trash can, equip it with a rack to hang leaf (and I added a grill thermometer). The leaf was strung on wire, and hung near the top of the can. With the can lid on, I positioned the can on top of a barrel-shaped Brinkmann smoker. A small charcoal fire was set in the bottom of the smoker, with a foil packet (punctured with a fork) of wood chips resting on the charcoal. I also kept a pan of water on an intermediate-level grill between the fire and the trash can, to prevent an unexpected burst of heat from raising the temp faster than I would notice on the grill thermometer.
Once done, the leaf still needed to age.
My approach can be considered as an example of a cheap and simple method. It's certainly not the best or most efficient. A real smokehouse with a much larger capacity would be nice. But I have tried with fire-curing and flue-curing to demonstrate that anybody can do these without special skills or spending a fortune.
Bob