Can't tell for sure but it looks like 11 gage (1/8") or better steel with some good angle iron and tubing structure. If it really is that heavy it might be a pretty good cooker, pretty durn pricey though.
Weber 26.75 OTG w/CI grates & SJ/WSM Mini
Home built 24"x72" reverse flow stick burner trailer with 18"x44" grill w/CI grates and upright SS gas oven/smoker.
Home built 48" fire pit with a 30"x30" Santa Maria style ranch grill.
Home built lump charcoal retort, iGrill & a bunch of other cooking toys.