I really like the idea of this oven for providing some flexibility in camp cooking. I am also planning to make myself the 1 oz. grill described here:
However, I was wondering whether you could replace the baking shelf in this oven with a series of closely-spaced spokes or rods, similar to a regular oven rack. If they were spaced closely enough, they would support muffin papers, lumps of dough, or whatever.
Most importantly, you could then use those spokes and the titanium sheet in a different configuration, as a grill. Specifically, it seems that you could place the spokes vertically across the front of the oven as it's shown in Dan's pictures, then lay the oven down with the concave side up, stabilized by rocks or whatever, with the spokes forming the grill. Having the curved titanium bottom to reflect and concentrate heat would probably make the grill very effective with a small fire, and would essentially form a fire pan, which would make leave-no-trace easier.. You might have to roll the titanium sheet the opposite way from the reflector oven configuration, to avoid impacting the reflectivity with soot in the grill configuration, but it seems like this would work easily enough as the whole sheet seems to roll easily. Maybe it's also functional in this configuration (or with slight modification, such as moving the aluminum sides closer together on the reflector) as a wood stove over which you could boil water...? If so, it seems like that covers just about every cooking option from your home kitchen, short of a microwave, and doesn't add much weight over Dan's original concept.