The face frames covered the edges of the plywood and attached nicely with the tongue and groove joints. At some intersections some tongue material had to be removed so the face frames could fit correctly. This following picture shows an example of this as the vertical grove in the cabinet was trimmed to make room for the horizontal face frame to meet flush with the vertical face frame.
With the cabinets fully assembled I could now build the box for the drawer.
I had to make 2 spacers in order to mount the sliders up past the lip and flush with the cabinet frame. I used Accuride sliders need very precise spacing to operate correctly so I had to sand the sliders a bit to get it just right so it wouldn’t stick. The sliders are self closing and provide some resistance to being opened which works out great for a teardrop which is on the move.