In order to get the inside pieces of the box to be flush with the frame sections I cut the pieces of fishtail oak the same size as the pieces of marble ,routed a rabbet that when glued to the marble would end up flush with the frame sections plus give me some glue area for when the pieces are assembled. I used 2 -part epoxy to adhere the wood to the marble.
The base of the box is made from 4 pieces of stock that are 3/4” thick and 1 1/2” wide, mitered on the corners , routed to accept the lower parts of the frame sections and finished with an ogee accent.
This photo shows the 4 corner pieces in place which have been routed with 1/2” grooves on the inside to accept the marble
Marble sides in place .
Top sections of the frames in place
The sections of the lid were cut on the bandsaw at 20 degrees then cut off at 90 degrees to give a 70 degree bevel.The 1/2” groove was added for the marble and mitered to fit the top of the box sides.
On to the glue-up