It needs to be lightweight, cheap easy to cut and work with.Also I will be either glueing or screwing on aluminum and or plastic for advertising purposes.
You can get foam core tagboard from Wal-Mart or any similar store.basically two pieces of thin cardboard with 3/16 or so foam in betweenVery easy to cut with a modeling knife or utility knife or even scissors, comes in all colors, but tends to warpYou could screw things into it or glue onto itOption two is plywoodFor about 10 bucks or so, you can get a 4' x 8' sheet of plywoodHarder to work with but sturdier no doubtOption three is to actually buy a presentation boardI think Office Max might have them - they're pre-cut tri-fold presentation boards that fold into a nice little package with a handleIt's up to you to do some shopping, I guessFoam board is by far the easiest to work with.
The aluminum foil, because it has a larger surface area to volume ratio, and thus it cools off slower.
aluminum foil because the heat disipates fast and will have 0 heat to the touch the pan is thicker so it will take longer for the heat to disipate touching it will definitely cause a burn heat transfer is based on the surface area and the thickness of the object also the shy part of the metal will mostly reflect the waves of heat