I made a home-made reflector oven from one of many patterns obtainable on-line. It's a one piece folding design and works well but is far from as well made as yours is. Even using lightweight aluminum flashing its heavier than your model and that's without a carry bag.
I also made a round flashing oven that works on fire or Peak 1, and it was a winner on last May's trip when I met IC and Ranger.
For my usual solo trips, I would fore-go any stove and do the Bannock/Fry pan bread route.
For a tandem/group trip a reflector oven is really a nice accessory ;D
Besides the obvious baked goods, a fresh baked Lake trout would be a real special treat!