Reply by JustJoe

If you mean thickness, I don’t remember off the top of my head and its too cold to run out to the workshop and look at the book.
Width (like height or drawer) you use the full-scale templates in the book. Jut hold the end of one board up to each one until you find one that centers nicely and then note if you should start on an A or a B.
The A and B are interchangeable – you don’t have to use the A for the tails and the B for the sockets. If you make it one way (A for Tails, B for Pins) and don’t get half-pins on the end, then just do it the other way (B for Tails, A for Pins).

edited to say half-pins.

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