As a bit of background, I used to have a few SA Trangias but had to give up the last one in India as I went over baggage (the excess charge would cost more than another Trangia). I've been meaning to replace it and noticed this thread. the Military Mart (no connection) mixing together of Euro pot set with a Swedish grate seemed a clever idea. Coincidentally I had picked up a W. German mess kit in Germany so bought a grate off MM (£1.50!) with the idea of making them fit together by bending the grate into shape.
First thing was to cut out the base so that the grate is more of a tube and easier to bend.
As standard, quite battered so I have no qualms cutting.
I used tin snips but a hacksaw blade would work too. The metal is very thin and easy to cut. If you do this, file the cuts down after because they'll be very sharp.
The next thing that needs to be cut is the side slits as they are too narrow for the pot bail. In retrospect, the former E. German equivalent has a simpler, thinner bail attachment so may be a better match. 3rd pot of the E. German set also has its own handle.
Before
During
I finished the enlarged slit with a small round file on the sharp corners so there were no stress raisers
Now for the bespoke bit. I fit the large pot and pushed the grate into the concave of the kidney. Then removed the pot and pushed a bit more to create the kidney shape. Then with the pot back in and a screwdriver to lever, I pulled the parts of the grate that scraped the pot outwards
This took quite a bit of to-ing and fro-ing to get the shap close.
More or less there.
Then to lock everything together I drilled out some holes at the bottom and filed together into a slot so that the pot handle would go through the grate and hold everything together
Up to now it was straightforward. Unfortunately two things started to become a problem. Firstly because the grate is now mishapen the pot supports inside when moved, grind away at their retaining holes. Secondly, they also interfere with the pot handle preventing it from fitting properly. My first solution to this has been to remove one pot support. The big and medium pot can be supported with one support. the third and smallest pot is just too wonky. But then a SA Trangia would only have two pots anyway so the third could be a free cup.
In hindsight I would (and probably will) remove the second support and instead drill four holes and use two cut-down removable tent pegs to support any of the pots. The pot might then drop low enough so that the pot handle could go under the grate to lock without the need for the slot.
1.25 litres (to the top ridge of the big pot) boiled in about 9 minutes from lighting the (civvy) Trangia burner the small pot which I guess holds 500ml boiled in 3 minutes with no cover. One other observation, when using the small pot with handle, the pre-existing front gap in the grate directs a lot of heat to the handle making it way too hot to touch without a cloth. I did think of rivetting another piece of aluminium over this but the rivets might catch the pot on the inside or fingers on the outside.