I just meant access to the fittings, etc. in the event something has to be repaired, instead of a hatch in the floor where it can be seen or removable floor panels. I had the draw tube dry rot off inside my fuel tank in my skiff while I was running this past summer. Couldn't figure out why the boat just died and after drifting 2 miles, searching for anything that could be the problem and saying about every profane phrase in the book, I figured it out. I was able to rig it to get back to the dock, but had a rough time fixing it due to limited access.
Definitely put the vent and fill on the gunnel.
Miyot, Did you bevel your sheer clamp and add the gunnels prior to glassing the boat, or wait until after?
It appears that the spray rail and tublehome bumper are added afterwards, but prior to finished painting. I assume that they get glassed and faired in as well before painting.