Phil, although unrelated to the seat pan question (sorry Brian) but do I see removable upper and lower boot cowl sections ?. Reason I ask is that I'm planning on doing the same thing, if possible. I'm a month or so off fitting up the cowl, but I was looking at splitting it horizontally as you appear to have done and then attaching screws into anchor nuts on a bonded in place backing strip. If removing the lower section, I guess you need to uncouple the cooling duct. Not sure what would be involved if removing the top section, or if that's even possible - haven't investigated that yet. Anyway, looks good and would allow great access to everything behind the firewall.