We installed a Vent-a-Hood insert over a 48" DCS dual fuel range. I'm not sure this is exactly what you have in mind, but I'll try to describe.

They built a plywood box around the 10" pipe coming down. It was initially about 36" wide around the pipe, and then expanded out at an angle above the base of the liner so that it was now 48" wide. The vent liner just fit up into the plywood box.

Around the lowest part of of the plywood box they put a vertical plywood border. On this face of the border they put travertine tile, and then added tile trim on the top and bottom so it would hide the joint between the plywood and the vent-a-hood. To cover the upper part of the plywood box we hired an artist to first paint it with a textured paint, and then paint a design on the part that would be right above the stove.

I uploaded a picture that shows what it looks like.

Bruce

I never saw this response! Thanks! Do you happen to have pics of the box before they decorated it?