Where are you located?
You might want to check into rockabillybass.com, if you haven't done so already... those guys know a lot about what you need to do to a bass to make it stand up to the abuse of the genre.
However, you may find that the structural modifications and the "beautiful warm tone" might be at odds with one another. Most modern rockabilly players are pretty heavily amplified, and acoustic tone is often secondary to beefy construction. Hopefully, some guys with experience in the 'billy world will chime in. BTW... there's also a 'billy section in these forums.
Best of luck to you... if I tried that stuff at my age, I'd be in the emergency room.
