Step 1: The Situation
This is a perfect situation to improve upon my earlier solar cooking ideas.
See here: http://www.instructables.com/id/Dashboard-Chilli/
Step 2: The Result
Step 3: Gathering the pieces
Be sure to cut your box accordingly if you plan to make one.
Step 4: A little design consideration
Step 5: More design consideration
Step 6: Some Assembly Required
Likewise the liner fits nicely into the oven box.
Step 7: The Insulated Floor
The insulation I used was just shredded documents I salvaged from the office shredder.