I hope the plywood in the picture is for display only. It is inadequate to support that much cantilever. You need a custom metal square tube frame.

What are your cabinets love them

@Joseph Corlett, LLC Thanks for your input on this. The counter will be 54" x 115" with a 15" overhang on the wide side and a 14"-15" overhang on the long side. There is a 2x4 pony wall in between the base cabinets. I did ask about a full steel frame but my cabinet fabricator and countertop fabricator are confident about using 2 sheets of 5/8" plywood with metal bars routed and expoxied in between the plywood sheets. The countertop will be 2-2 1/4" thick with a miter edge due to the plywood. What do you think about this and if you don't think it's sufficient, do you have any photo examples that show what you would propose?

@Mimi Thank you, the cabinets are a rift cut white oak with a slight white lacquer stain.

I agree with rebunky above...great selections, beautiful quartzite, but the perimeter counter looks off to me as well. I would pull a light color from your quartzite and do that as a solid color for perimeter.

"What do you think about this..."

Ask them to walk across the cantilevered perimeter. Watch to see if it deflects and if it does, by how much. If they refuse, that will tell you all you need to know.

The underlayment is the countertop. The stone is just veneer that makes the underlayment pretty and functional.

I don't have any pictures, but I'd have my crew dance a Conga line across any cantilevered custom metal frame perimeter I've ever designed and installed.

Do you have a finished photo of your kitchen? We’re using the blue Tahoe as well and trying to figure out coordinating cabinets