Nice! I regularly bake, and have one of this type of Solar cooker. I was thinking about doing this, but was worried my bread would expand too much in the baking and get stuck. I suppose sizing is key to good results. It is encouraging. Thanks for sharing, and I'll have to try!
Oh no, this isn't me sadly. I recommend following them though, its a couple who lives on a sailboat and makes extremely DIY software among other things
These vacuum solar tubes are common for solar-hot water heaters. Work really well for that, but this is the first time someone tried using them for something non-liquid I think.