That is a nice set of photos, a really nice web page and yes thatís a great looking handle.
On the handle issue. I have in the past gone into the fly shop with my callipers and measured fly rod handles that I like, then drawn a profile, and used it a guide while turning down the cork.
The last couple of grips have been similar profiles to the Full Wells that Sage puts on their rods. I like the exaggerated dip in the front end because in fits my thumb really well.
I have recently stopped using filler. I notice that after a couple of years that the cork and the filler wear differently and it just bugs me. The last rod I built I used premium cork rings, and no filler at all. I think the pits that are left in the cork add a little character. Its an experiment so we will see.