The top, mostly glass, are shown here sitting on top of the lower cabinets. There will be a solid wood panel between the bottom and top cabinets and a solid walnut top on top of the top cabinets.
So far the only screws that are in these cabinets are a few holding the bottom trim at the bottom cabinets.
Because the walnut panels that will separate the top and bottom cabinets and cover the top cabinets are solid walnut I had to improvise for wood movement. Not doing so would have meant that the attachment screws would probably pull out or break. And their heads could not be above the surface or bottom of the panels.
Another problem that the Festool Domino was instrumental in solving that allows for the expansion of the solid walnut panels. The panels are 16.5" wide, 24" long