Our kitchen reno is wrapping up and our final project is a custom range hood! Covered range hoods allow exhaust hoods to look either like part of the cabinetry or a statement piece all on their own. I'm opting for a statement piece and will add drywall, moldings, and corbels to mine for a vintage look. 

For tools, I made this using Solidworks by exporting the faces with DXF into Adobe Acrobat and printing my pattern transfers to 8.5x11 printer paper so I could have a pattern to cut my plywood with. Can you tell I'm also a sewist? ;)

These hood covers are expensive and I knew could make one that fits our tall ceilings better and fits perfectly in our space. 

In Solidworks I created a backplate, several ribs, and two platforms that will allow the hood to be positioned over the stove. This internal structure will hold the drywall and the trim and becomes the frame where I can build the final finished form. Two platforms support the ribs and allow the hood to be hidden under the lip of the frame so it won't be seen unless you peer under it.
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I created a DXF export from each of the faces so that I could pattern the profiles into a piece of plywood to cut out on a jig saw and assemble.