I played that six-string bass today. It's from the luthier who made my fretless bass (click for the thread I made). He made it for himself since he sold his six string warwick thumb. It sounds great! I just thought you'd like to see some more of his basses so here's his website: http://www.chicasybajos.com.ar What do you think? Personally, I really like them. (shameless plug -->) Oh also you could send him an email if you are interested in a custom bass or something.