The Roscoe bass company appears to be mostly a custom shop with each of there basses being somewhat personalized to the player. We had a correspondence with the maker of these fine instrument. the specs from him are listed below.
Exhibition Quilted Maple top over Swamp Ash body.
Bartolini pickups and Bartolini 3 way EQ.
Probably Rosewood fingerboard.
Black/Gold Hipshot hardwares.