I fitted mine in a very similar way to above. I fitted it just to the right as you entered the door, this allows me to put a fire proof mat under the stove (my belltent has a built in ground sheet), and use the same mat to stand on, this way i have i can stand inside on the mat in my boots without getting the tent muddy.
A couple of things to consider;
make sure you check the length of the tubes that make up the flue pipe, make sure you fit the flange in the centre of a length of pipe (rather than on a joint).
if you have the rubber type flange then you will need to decide before cutting if you want the rubber pushing in or out, i went with pushing the pipe from inside (making the rubber stick up
the closer you fit to the out edge of the tent the more of your flue pipe will be outside the tent. This is a compromise as putting the stove near the side feels safer and a better use of space but you do lose a lot of nice hot pipe outside. if you fitted the stove towards the centre you would have about 6' of hot pipe inside acting like a radiator. I went for it being nearer the the wall but i do look enviously when i see a tent with all the flue inside the tent. I can still get my tent as hot as a sauna but it does feel like im wasting heat.
Also my tips from using a frontier in a 4m bell tent is that the frontier needs an extra section of pipe to get the smoke and embers up and away from the tent (saves it getting sooty). I also bought a spark arrester (sp?) which has the advantage of having lashing points for guy ropes which is great if it gets windy. I got both of these extras from Military Mart
Let me know if you think of anything else
Dave