I wound up using this to help seal my door.
Still working good after +6 months. Look around at the different types of gaskets he offers - I chose the self adhesive technical felt, but there are other options. Wish I had put straps on the inside like your mockup so the gasket would seat better. I still might add some like you have it.
26.75 Weber OTG & SJ/WSM Mini
Home built trailer mounted 24"x72" hybrid/reverse flow stick burner, 18"x44" grill w/CI grates, upright SS gas oven/smoker, iGrill & a bunch of other cooking toys.
Home built 48" fire pit with a 30"x30" Santa Maria style grill.