I think I've made five now that have lasted well and functioned properly, and it has to be stainless to be worth doing, in my book; all the stuff made from tins and carbon steel just rusts from the get-go and if you want durability the weight goes up unless it's stainless as you have to use a heavier gauge of carbon steel. I go round the charity shops, Wilko's, poundshops etc. and buy up food-grade stainless 304 items and butcher and adapt those.
The one I use now will make a big brew and bake a decent bannock on one burn, is 120mm D X 170mm tall, but comes in at 700g for stove, billy, trivet, potholder and small brewkit.
I think if I was going to go the tall and skinny route you speak of, I'd want to make a prototype with food cans or somesuch as I think it'll take some experimentation to get one that shape to burn well. The important thing for these to burn efficiently is the relationship between the size and placement of all the holes in relation to the volume of both the main burnchamber and the "airsleeve" up the sides; a lot of people make them and then say they don't work well when what they should have done is made a template with cans and played with the variables 'till it worked, then make the one you'll use.
Apart from anything else, holding these shapes while you cut and drill 304 stainless is not something you want to do more often than necessary and not unless you know it's a keeper!