How to build a solar oven with cardboard boxes, tin foil and plexiglass - eviltoast

This looks like a fun little project that I think people here would enjoy! I have a little stack of tin foil takeaway boxes that I could use for this. Just need to get hold of the plexiglass (or the oven bag they suggest, but I’d like to do it entirely with reusables if possible).

EDIT: Grammar.