Thanks GED,
As for a flue I was thinking baked bean tins coming out at 45 - 60 degrees from the side and some fire cement. I have no welding gear to do anything fancy. Also a bean tin at 90 degrees to the side to act as a feeder shoot and extra air flow. ( As in rocket stoves {think thats what there called}) I have some shelveing suppoorts which could be bolted on to act as legs. Its all got to be done with a dremal so it has to be low tech!!! Small door to get rid of the ash?
The flue must not be at a shallow angle like you've drawn. It really needs to be as near as possible to vertical for most of its length.
Baked bean tins will work, but they might not last very long before they burn through. Depending on how many you eat it might not be a problem.
I'd try to find a bit of pipe, stainless can have a thin wall but if it isn't stainless it needs a thicker wall to last any length of time. Incidentally fire cement is very brittle once it's set and will crack, so it isn't great stuff to try to use as glue.
Rocket stoves are usually insulated around the firebox to improve the combustion efficiency, increase flue gas temperature and so get better draught. You can get away without insulation but it won't burn so efficiently. You might be able to cast something to go in just the back of the stove so that you get some increase in firebox temperature and more of the heat comes out of the front.
Legs bolted on for stability is a good idea, especially if the legs make a wider base than the stove would itself.
The fuel feeder pipe is often angled down into the stove so that you can load it up fairly full and let the wood fall into the stove as it burns.
Nothing wrong with having a door for the ash but it's best if it's sealed so that the stove doesn't burn uncontrollably. It might be a lot of trouble for relatively little benefit. A lot of domestic wood-burning stoves have no grate and no ash pan, the wood just sits in the bottom of the stove to burn on the ash. It's solid fuels like coal that need a grate and a bottom air feed, so if you're burning just wood don't go overboard.