Re: Lets have a chat about multis.
Class A CE certification was an option for the 105MC, it required modifications while it was being built (not extensive, but not add on at a later date).
For example, some of the options were additional bilge pumps, high toe rails, a higher sill from cockpit to inside, bigger drainage holes in the cockpit. It may or may not have included actually sealing the float tanks.
My Gemini (a 2007) was not CE class A certified; I didn't opt for it.
I don't know if Hunter (who now builds it) has continued to provide that option or not.
Lessons learned are opportunities earned.