I like it, its says octopus limb to me when I looked at it, so immediately I thought perfect for the nautical theme. 
And it will appeal to the Japanese audience.

Anyway, lovely piece. May I suggest adding rivet strips to the inside of the cupola to cover up the "view" of the glue area? Apologies if you were already planning it - I once messed up a perfectly good model because I forgot to paint the inside of the struts before glueing them on, and couldn't add more struts to the inside...