Sometimes Tim can special order a kit that is a little different than what he's got in stock. It may take a while though. You may want to send an email asking.
It's a cool kit!
Of course you can also do what I did with the base in my avatar. That started off as a fretted pitbull kit. I pulled the frets off, filled the slots with a light colored veneer, and sanded down the fretboard. I've read that's how Jaco Pastorius got his fretless bass. Now if I could just play like him!