Hello.
I have an idea of building 8 string bass

Sense idea - combine bass & guitar in one instrument, for the hell solo & tapping.
At the moment I'm working on the design ... silhouette taken from fodera emperor, lengthened the "upper horn", "underhorn" taken from zon sonus, "ass" from conklin, headstock taken from jerzy drozd.
And finally got here is:

(image is very large)
Recommend that the change in design?
Body will be made from swamp ash, neck - laminate wenge/mahagony, fingerboard - purpleheart.
3 pickup - 2 for the 6 string (bass part), and 1 for the 4 string (guitar part). Preamp - bartolini for bass, and midbooster for guitar. Machinehead - gotoh. Bridge - hipshot single string.
Today it is all ... start saving money on materials for this project.