I started off with the keels looking like this:
By the time I decided it was good enough to stop (on Saturday morning), things were looking like this:
I don't think I'm 100% done shaping the keels, but I decided to save the final fine-tuning for after the decks are attached and I'm pre-fairing the entire hull. And I'm done with using the sander on the keels - next time will be all longboard (I'm afraid of going too far, as I mentioned).
By the way, I don't want to give the impression that I spent sixteen hours on this task -- it was more like three to four hours total, and a lot of that was on careful sanding of problem areas. It seems clear to me that Ian designed the building procedure this way (vertical keel plank\batten combined with post-float-join shaping) in order to avoid any tricky tight thermoforming around the keel area. If that was his goal then he succeeded, but I'm not yet sure if the new method is any better - but I'll tell you in a year when the boat is done :). (And I wonder why he designed the F22 float keels with less of a knife-edge that his other trimarans seem to have?)
Lastly, the resonance of the sander on the hulls makes a curious thrumming sound. My wife says it sounds like there's a full-scale light saber war going on outside. No sightings of any storm troopers, thankfully.