Custom plinth

I don't see how the roundover edge through the veneer, on top of the plinth, doesn't expose the plywood?

The top veneer is applied over the edge of the  edge veneer. Therefore the top veneer is protruding past the frame plywood by whatever the thickness of the veneer is i.e. 1/32nd

I’m with mijostyn on this. Veneer is not worth the effort. My ply has a 1/3" slab of solid walnut on top and the sides are 1/2" solid maple.

I am not a fan of veneer as thin as that used on the project. However Veneer has been used for 150 yrs that I know of. I’m sure longer, but I’ve never researched it. The difference is thickness. Apparently , you have veneer on your TT also. Its just thicker. BTW, I bet your veneer also comes together at the corners.

If properly cared for, this plinth will last a long time...maybe as long as solid wood. he guarded it well with a good finish which has some thickness to it. Polyurethane is a great finish for veneer.