fantastic job man, looks beautiful.
i've been wanting to do the same sort of thing for a few months now - your thread is actually the reason why i stumbled across this forum. i was searching around for wood seats on the internet and this came up.
i have no experience working with metal, but my wood working skills are good. its nice to see someone else has done it and not been laughed at. i'm thinking about chambering the seat in a sort of "stair" formation and then filling in the rest with bondo to save some weight. i've also toyed with the idea of using ebony as the base of the seat (above the seat pan) and clear coating that.
anyhow, great work and a cool little unique touch!!!
i'll post a response to this thread if i ever get around to this seat thing. probably sometime when the weather gets nice again.