I would be very back and forth on this one too. It's an incredibly tough call. But no need to rush, either.
On the chopper gun construction, it was not just the decks but the hulls as well. I have noticed a distinct lack of information concerning hull construction/lay-up schedule details on their website, which makes me suspicious. All I've been able to find is this statement: "The GRP hull is reinforced with a grid structure at floor level to give it increased stiffness."
For the tender, probably the two most important items would be a good anchor/rode system and a VHF. Flares and emergency water next. It's not a bad idea to have these regardless of the draft of your mothership, though.