High elevation helps canister stoves work at lower temperature.

Your set-up looks pretty simple... and more important... pretty safe. Well done and thinks for the info. The reason this kind of thing isn't discussed more often is because if you get too much thermal feedback, you have built a bomb. People tend to be hesitant about giving advice on the internet which could kill somebody who isn't careful.

A good rule of thumb I have heard is: as long as you can comfortably touch the canister it is safe.

Thanks for posting the pic!