Roger,
You are Correct, The rosewood blanks that I will be cutting and shaping to size are solid Fret Boards with no Ply inserts.
David Wright posted that His Father sometimes would use plywood to reduce costs in construction on some of these 4 neck Steels made of wood.
I surmise that two of the cut out blanks were used for the end boards, as they are Bolivian rosewood as well. you can see one of them in an earlier post.
I will be using my planer to size these blanks down to about 7/16", to raise the fret Boards up 3/16" higher than they are now. That will be the only change I have decided to make, to show off the grain of the Fret Boards.
I have just completed the 6th and final coat of sanding sealer on the cabinet, Now I will moisten the wood and Wet/Dry sand one final time and use a Tack Cloth to clean the derbies off the Cabinet in prep for Shooting the tinted clear Lacquer. Here are a couple of Pic's
This is the last coat of sealer
And this is the cabinet assembled and whetted down to check for standing grain.

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