Looks like you got your answer, but I can go measure if you want. Had mine for about 3 weeks and love it - lots of real estate! Been thinking of making some accessories and always looking for good ideas, what do you have in mind?
PS: the charcoal grate has a neat support structure kind of like an upsidedown suspension bridge running through the center to keep it from warping under heat. Really neat idea.
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.