Very pretty for a RickenTractor™
Some proper product design type stuff going on there!
I had a similar problem with the Gretsch - the ideal place to anchor my thumb was on the acrylic neck pickup surround, but it was too thin at 3mm.
I 'borrowed' the jet black Coreon sample from work, cut it down, filed it to shape & fitted over the pickup surround using the same screws & holes.
You don't see it, but it gives me a great anchor position.
Not as clever as your design though