Best solution for creating a strong kitchen microwave support.
I'm replacing a range hood with an over-the-range microwave. There is a soffit now with a cabinet underneath which must go to make room for the microwave. I'm going to put in a box shelf between the soffit and mw to make everything fit. The mw is about 50 lbs., so I don't want it to end up in my lap, so I'm looking for some real strength in the box. It will be a four sided rectangle. Rear of the mw will be supported by the manufacturer's bracket across the wall studs, but the front will need to be screwed into the bottom of the box.
I'm thinking dove-tail would be best on the box joints, but I do not have the equipment or the skill at this point. I do have a Kreg set-up so I may try that for the box corners.
Also, assuming I find studs in the soffit, and screw the top of the box into a stud would this be load-bearing problem?
I'm looking at solid poplar 1x12 to make the sides of the box.