Last night I made the 54"-long front and rear solid mahogany trim pieces for the laminated desktops. After I routed 1/8" radius round-over edges on a 54"x29/32" mahogany board, I ripped four strips to 3/4"x29/32"x54" pieces for the trim edges.
Also, I removed a 1/16" from the thickness of the mahogany blanks for the breadboard ends. This will compensate for the laminated tops only being 29/32" thick and not a full inch in thickness.
Next, I will mount the trim pieces to the desktops and then cut the desktop ends to prepare them to mount the breadboards.