What an awesome instrument!!! I'd love to hear you play - do you have any sound clips or videos?
You can hear two similar instruments of Seth's being played here: Link Removed
I got to play both of those basses when I was down at his workshop picking out wood for my bass - he'd just finished them and was preparing them to ship to Wermland at the time. They're both smaller instruments, walnut and Engelmann spruce, one was tuned in 5ths and the other in 4ths. I really liked the 4ths bass. It was harder to judge the one in 5ths because I haven't practiced that tuning at all, but it was really fun to play.