The TitanRF fabric isn't super durable, so a shell around it is a good idea. I've had great luck with Ecofoil NT material, which is somewhere between cardstock

The TitanRF fabric isn't super durable, so a shell around it is a good idea. I've had great luck with Ecofoil NT material, which is somewhere between cardstock and cheap poly tarp material in handling properties. (It's a polyethylene weave with foil on both faces.) Easy to work with, easy to fold and tape, easy to cover with other materials for durability. Super cheap in big rolls. For 120VAC passthrough, the Delta 20DBAG5 is cheap and cheerful. Screw it into a metal junction box and tape all sides of the box to the chamber wall. But a battery in the box is simpler and quieter. If you need windows/vents, avoid the hobby-store copper mesh that's meant as a stiffener for clay models; the way it's woven, it isn't guaranteed to have connections to itself in adjacent rows. It's good at first but any surface corrosion ruins it. Go with punched or "expanded metal" sheet, even if you can't find copper, aluminum or stainless works fine in practice. Just make it significantly larger than the window opening and use plenty of foil tape at the edges; I suspect that capacitive coupling through the surface oxide layer means it's an RF short even if it looks open at DC. I've been wondering if ITO-coated glass would work as a window but have not tried it. But it's no good for ventilation anyway so I'm not sure it's worth the bother.