I know how I used to get that effect - sloppy joints with lots o' filler!
Seriously tho', CP, that is cool. Thanks for sharing some inspired work. Seeing what you did and knowing what went into it, makes it all the more awesome.
1/4" walnut, and a couple of thumbscrews to hold it on.
The dial plate is cut and drilled, but not lettered yet.
As for knobs I may make wooden knobs with a piece of fret wire imbeded as indicator, or continue the theme and do a very thin dovetail in contrasting wood as pointer.
John
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Do not limit yourself to what others think is reasonable or possible.