I assume it HAS to come off? Would not just lowering the radar arch be enough?
On our old 35’ Futura, I often pondered the assembly process while lying on my back under the flybridge helm station, but could never really figure it out. It almost looked like it was being held on only be gravity, but I really doubt that is the case. I never saw any bolts or screws, which kin da says they are blind from the salon below.
Sorry I am not much help here. Good luck though. There are a small handful of Senator owners here. I hope they can help.
2000 Navigator 4200 Classic
(NOT a trawler)