Lew Hodgett wrote:

The biggest PITA of the whole process is making sure the wood is
flush with the plywood after assembly, IMHO.

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"-MIKE-" wrote:

I gave up spending the time and effort to even try to make them
flush
when gluing and setting up. Now I simply make install them a bit
proud
on purpose and then trim them flush with a pattern bit in the
router.
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The "Tongue and Groove" technique minimizes this problem.

Start by measuring the thickness of the plywood using a dial caliper.

Plane the wood equal to the thickness of the plywood + 0.020".

Center cut the "tongue" and "groove" cuts on the respective parts.

Glue the assembly together.

The result will be a joint that leaves the solid wood 0,010" proud
on both top and bottom surfaces, well within the scope of a scraper
for final finish.

The scraper can easily be positioned to clear the plywood surface.

Just another way to skin a cat,

Lew