"..was told i should galvanize my bulkhead too.." - this is entirely up to you.
Galvanizing helps slowing down the corrosion process and many consider it a good investment. As is doing this to other metal bits.
However, it requires good preparation and a plant that is serious about their work. Extra holes need to be drilled (14 mm or bigger) to avoid air pockets, grease, glue, plastic etc. must be removed and several people sandblast the metal for better adhesion.
Some people make a frame, some don't.