What my DH did is cut a hole in the desktop where I wanted the machine to sit, with enough room for the wiring, extension table for machine and room to get around and reach the feed dogs) measure the height from the surface of the desktop to the point where I wanted the machine to be level (sewing bed, plate, whatever you call the thing the fabric slides over!) and then he built a little box just that finished depth, with dimensions to line up with the rectangular hole and screwed it into the bottom of the desktop. He drilled holes in the bottom of the box so I can run the wires through it.
If your DH can do a cabinet, I bet he could do that also. All we did was repurpose an existing old wood desk!