Step 1: Scope and Materials
1 piece of big foam board (2ft x 5ft)
1 roll of reflective tape
1 box of aluminum foil
1 box cutter
1 pair of scissors
1 roll of clear tape
Some materials you probably already have, like scissors and foil (standard price for foil is about $5). The foam board will be around $12 and the tape will be $8. The box cutter will probably be $14.
This project will take 2 days, with breaks, if you are a perfectionist. When handling the box cutters you will want to be careful, but other then that the rest of the materials aren't very dangerous. If you don't have any of the materials listed above, you can use cardboard, aluminum foil and standard scissors for the project. We found that the above materials work best, though.
When finished, the size of the cooker should be 26 x 12 x 24 (in inches).