...why would you go to the trouble and not use mahogany?)
Ask BaCH. Their basses are definitely NOT the same species of mahogany, Swietenia macrophylla, as 60s and '70s Thunderbirds. Anyone who has a passing acquaintance with the real stuff can tell at a glance. Sorry to get so picky.
This guy says his is ash, from the look and weight Northern Ash.