Hey, Gaucho,
Henderson will make all sorts of custom stuff--like zipper on legs and arms, etc.--so, I think that if you have a specific request for a removable hood kept on with snaps of the like, they will probably do it. AT A PRICE!
I have a Hendeson vest w/o hood that I use when the water temp gets below ca. 78 deg. I bought a separate (non-Henderson) hood which I don on almost every dive, regardless of water temp. I did not want an integral hood because it seem awkward and I do not dive in supercooled water that requires a skin tight fit. I just like the extra warmth that a hood provides. There are lots of separate hoods in the market.
Hope this helps...
Like kwesler, I, too, have had to repair my Henderson around some seams--on one leg at the knee patch. I sent it to Henderson the first time and they did the repair for what I considered too much money. The second time I repaired it myself--we were on a dive trip and would not be home for three weeks--and my repair worked as well as Henderson's. It was not quite as cosmetically attractive, but it has survived many, many dives.
I did the repair with a neoprene repair kit. First I dried off the tear with Barbara's hair drier (carefully); then I glued the edges of the tear and held them together until the glue set sufficiently to hold without my help; one non-alcoholic pina colada and a few chapters of the book I was reading later I sewed the tear with polyester thread (the only kind I had); finally, I spread the glue over the sewing inside and out. I let the repair sit for ca. 12 hours (overnight) and used the suit the next day. It is still in excellent shape.
I am not certain that the repair is technically completely correct--I sort of invented it based on intuition. I probably will continue to do all my repairs from now on.
Joewr