Before making the cut it’s important that the kitchen hood cabinet be centered over the vent pipe. If it is not positioned properly make sure that you will be able to make the transition work before cutting the hole. read Cut Kitchen Hood Cabinet for Vent

This is a question that gets asked all of the time. Customers don’t like the idea of having to trim around cupboards so they want to know if they can wallpaper before the cabinets get installed. Absolutely not is the common answer. Why would anyone think that their wallpaper would be safe when a cabinet installer is trying to attach a 100lb cabinet to the wall four and a seven feet in the air? read Should I Wallpaper Before Cabinets?