Hi Paul.
You've done a nice job on the ships boats, I didn't use the vacform boats I got some from John R Haynes. two 27' whalers and a 25' motor launch (bit like cheating really) but great detail on them, and I've just got some for Bramble from The Model Dockyard.
I fitted A turret after the decks were finished in fact both turrets were fitted almost at the end of the build, although they had been pre fitted so I knew they would work "A" turret is fiddly but possible and both turrets have their own micro servos linked with a "y" lead.