I've had a few attempts at making a lightweight inverted canister stove now, each one evolving and improving as I learn from the deficiencies of the previous ones.
Warning: it's addictive! Here is my latest:
Total weight = 96g (3.4oz).
No lathe was harmed in the making of this stove. Instead, I made this using my pick'n'mix method: the burner and jet came from a Gnat, a cheap chinese stove was butchered to make the canister connector and the needle valve is a spare part for a R/C model nitro engine. The remaining parts were hand made from scratch.
The legs simply unscrew for packing.