After reading Outamatches post and link for a Flashing Oven, I decided to build one.
I had flashing in garage and some "ideas" of my own. One of the "drawbacks" in our minds was the inability to check on the baking items without removing the top pie pan?? I believe my solution solves that problem?

The original plans show a piece of aluminum flashing about 12" high and cut to the circumference of 9" pie pan plus a few inches overlap. There was 3 holes drilled thru flashing about half-way up to form baking rack.
These were made of small threaded rod. The flashing "tube" just basically set in one pie pan/w the other as the cap. A small hole was drilled in top pan with a mini hi-temp thermometer inserted.

I didn't have threaded rods and decided to go a different route? I thought steel rods would eventually start to rust, so I used heavy galvanized wire, the kind you hang suspended ceilings with. I cut 4 rods about 11"long and bent a 1" L on one end like a tent stake. One rod go's thru the bottom pie plate across the center thru flashing tube. I wanted a one piece unit to move around. The other 3 rods go across mid-way acting as the baking rack.
Because I didn't opt for threaded rod, I needed to find a way to retain tubular shape on top of oven. I chose to drill a 1/4" hole a few inches down from top, were the flashing overlaps and used a 1/4"x 1/2" stainless bolt and stainless wing nut to secure.
I found a mini high temp thermometer at do-it-yourself appliance repair shop. About the size of a quarter and reads to 550 F. It cost about $8.
While shopping for a top pie plate, I had what I think is a great idea?? I saw a 9" pie pan made out of silicone? The light bulb went on!! I could save weight and also address the problem of checking on baking item. I bought a 7" silicone trivet as well. I used a razor knife and cut out a 3" diameter circle in silicone pie pan and then laid trivet equal distance over bottom of pan. I then used my leather hole punch and put 1 hole thru trivet and baking pan, slightly smaller than thermometer. The thermometer acts as a pin and allows you to peel back trivet and view baking items without losing to much heat. Silicone remains fairly cool, so you can do it bare handed.
My first attempt at baking on my gas range with a diffuser was only partially successful because bottom was well done but top was barely done??
I quickly realized that I needed a baking pan smaller than the one I used because the heat wasn't circulating evenly! I went to smaller pan and it worked like a charm. I used it on my Peak 1 with equal success.
I made a wire bail for baking pan so it would be easy to remove. I also made a wire rack for baking pan so I can bake fish and let the oil drain off (thinking laker).
All in all, I think its a worthy alternative to reflector oven, with added bonus's of being usable on stove top and being unaffected by the rain.
Will give a "real" world report after my May trip??
It was fun to make and might be worth a look??

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Sorry about that

I don't see why it wouldn't work just as well over a REAL fire as well??
I'll give a field report after my May trip but I think it should be a winner??
I'll just use over hot coals, so it doesn't get to sooted up.
With the cool touch silicone top, I think you can just let it reach "temp" while you mix your ingredients and then quickly remove lid and insert baking pan like in conventional oven.
Anyway I was looking for good use for the extra flashing

I would be happy if it turned out to be a violable alternative to other qjers who don't have a oven or don't like using a reflector oven?
I have to add a warning about my choice of galvanized wire for rack!!
I owe the heads up to Screamingwindigo, who brought it to my attention that galvanized metal gives off toxic fumes when welded or super heated!!
I knew this because I used to weld quite a bit when I worked construction but I forgot not everyone would know this??
I pre-heated oven on kitchen stove(no wife to irritate)and ran range hood to vent fumes.
After about 20 minuted smell was gone and I made a test batch of cookies.
I believe the galvanized coating on the wire was eliminated but will keep a wary eye in-case I'm wrong about it??
It would be no problem to use aluminum rod or even the original threaded rod if you wished.
I went with what I had handy, so be aware of the potential hazard with using that wire?

you might be right about not burning off in oven
I didn't notice any funny taste or odor in the cookies I baked but maybe I'll just play it safe and get some aluminum rod and not have to wonder about it

After reading dd post of skewers for his reflector oven, i thought i have a whole package of them in kitchen drawer unopened!!
i still think i'll keep bolt/wingnut, weighs nothing and gives a little more stability to cylinder.
But the skewres would make good rack material.
its amazing how many good ideas are floating around here and how many people are willing to share them