Ollie,
The boxes are solid, top one piece, bottom another. Cuts are all milled into "virgin" lumber.
No inserts.
One false move and big OOPs! 2nd quality or discard and start over.
Glued from two boards - you are absolutely right , cheaper , easier; just not authentic.
If I'm going to spent 8 hours or so building and cutting, I want it to look as it should- same as you and your grips!
Maple boards should be here next week; hope to have the latches pretty much done by then too.
I've made two proto-types so the next one will be a "real" reproduction.