First of all, you are to be commended on the excellent graphics and detailed instructions. Even someone unfamiliar with DIY projects could follows your diagrams and written explanations to build the tin can rocket stove you describe.
My experience with a well-made rocket stove is that they simply get too hot to use metal for the core. The heat and erosion from oxidation result in the metal being worn away, potentially winding up in your food.
I need to stop being lazy and make a video or quality diagrams, like yours, about how to make a rocket stove from firebrick splits. It's nowhere near as inexpensive, but will last a lot longer and likely be safer, if that is a concern at all.
Would you turn that thing down? I'm controlling a mind here! Look ... look at the tiny ad ...