One thing I've used in the past is one of those aluminum foil pans you buy in supermarkets. It is heavier than roll foil but not as heavy as the MSR windsreen which I really like to use. The upside is that it costs considerably less too!

The bottom reflector screen is a good idea. Many many years ago I had an old bluet propane bottle stove that I wrapped with one of those Coughlin metal wind screens and it got too warm to touch. After noticing the heat, I immediately shut it down and let it cool off. Then I swore to myself to never let that happen again! Sending myself "into orbit" was not an intended practise!

I like the Tyvek kite screen. If the Tyvek ever gets hot enough to melt then you KNOW you wrapped it too tight to the stove to begin with! (melt at 275*F or 135*C, burn at 750*F, 400*C). The way it was shown however means that it block some/most of the wind but a fair bit still gets to the burner which will mean some fuel waste.

I read deeper into the following article - the oven bag material seems to be even better suited to being a wind screen material than Tyvek. Being almost clear, it won't be a reflector, just a wind blocker. And the extra idea of creating a roof is something else I never thought of.