Whoops, sorry, just re-read your post and you're looking more for design insights on the hood surround itself.
We're tackling ours with our experienced carpenter friend next weekend, so I can be in touch if you'd like details?
We're planning to build and mount a 2x2 or 2x4 and plywood frame no matter which exterior covering we choose -- sheet copper, trim wood or cement board for tiling. (Lately we've considered zinc since we made our own countertops out of copper and don't want copper overload).
If you google search the GardenWeb forums as a whole, you'll find a number of threads with more details.
Here's one such thread.
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Use door restrictors. Due to the projection of the hood, the doors on any directly adjacent wall cabinets will hit the hood when opened. To avoid dinging your beautiful cabinet doors, you have two options. You can add a restrictor to the door closest to the hood, keeping the door from opening past 90 degrees. Or you can use a door that opens away from the hood, as shown here.
Q