Solar ovens

So I've doing some research into solar ovens. The main 3 types are box, panel and parabolic ones (http://solarcooking.org/plans/). I was going to build the 'Solar funnel' solar oven but I think I've come up with hopefully the best of both worlds between a panel and parabola type by repurposing a Flat-Tiki V1 biochar kiln. It's basically a hexagonal inverse truncated cone - very stable. Note that most of the solar oven designs use Al foil and cardboard. You could replace the Al foil with adhesive reflective vinyl but it will cost a lot more.  The 1.6mm HW350 steel of the Flat-Tiki is less portable and heavier than cardboard but is more durable, weatherproof and will ultimately absorb heat that's not reflected and radiate some of that heat back into the oven space raising the temperature (which is what you want).  I bought 150m of caterers foil for 20 bucks and lined the whole thing including a base/back panel from my Flat Modular Biochar Kiln. I'm also using a Al foil lined garden pot for the pot stand. I bought a large black casserole pot with glass lid for my main cooker. The black absorbs the heat and the glass allows sunlight to directly cook the food and allows easy monitoring of the cooking progress. I used 'reinforced aluminium foil adhesive sealing tape' to patch up the Al foil which is waterproof, reflects heat and light and has an operating temperature range of -30 degs C to 300 degs C. It is a pain in the arse to separate the adhesive surface on the backside of the Al tape from the backing but worth the effort - this Al tape will stick to anything!

The oven took two hours to build, plus the manufacturing of the kiln - a kiln that I wasn't using anyway. Next step is to test it out and see how durable and effective this design is...