Adam Ironside: fretless on the cheap

A clever idea from Adam Ironside. So many times fretless can sound just plain wrong, but I think Adam does a great job with his home grown guitar.

Adam Ironside says:
Hey guys, been making this old guitar into a fretless the past few days. It has turned out pretty good for a first time I reckon?

What do you think? And does anyone know any good resources for fretless instructional material?