Oliver Yes on all three. for the bulkheads i had modified and were not part of the instructions,
I also used fibreglass sheet in 1/16" for all bulkheads and deck supports i bought from McMaster Carr. it is cheap and is very nice to shape and sand just ware a mask an go out side to sand when you do the sanding or the Mrs. wont like it much
.remember shaping the bulkheads to fit is a given when working with polyester resin layup hulls. when the resin cures it generates a little heat and it slightly warps the hull in places and there in is were the fun is you can easly "massash" into shape by placing bulkheads in various places in the hull.
if you would like a quick way to make templates get some plumers solder, the thick stuff and mark your spot in the hull were the bulkhead is to go then form the solder to the inside of the hull then pull out your shaped solder gently and trace around the outside of the solder and presto! bulkhead to a shape that is close for sanding.
Tom