They look good
We used to cook a lot of things in a cardboard box over years ago. Cakes and Pies mostly.
We tool a cardboard box lined it with foil, and used a few charcoal briquettes at a time to keep the temp at about 350. It worked great.
I never tried a solar oven.
Model X19H Expandable
GMC Sierra Pick up
Been a camper since I was a kid, and that was a long time ago :)
From pup tents with no floors, to tents with floors and flies, to a pop up, to the expandable.