DIY custom straight-sided vent hood with Zephyr insert

This is the LAST tutorial of our kitchen reno!! We've done the whole project ourselves so there are lots of DIYs to share with you, but this one was a brand new skill for us and I admit I was a little nervous before starting--but it turned out to be one of the most straightforward projects!

We wanted a modern, sleek, straight-sided built-in vent hood over our range, with an attractive insert visible underneath (as opposed to an independent, up-the-wall stainless steel vent hood like at our...