Hi Steve and Kenny,
Thanks for the thoughts, I kinda liked the idea and didn't want to drop it with out good reason so I'll see what I can come up with. I was sure I had seen a Mig ot Tank kit with twin Maxim AA MGs somewhere on my travels but I can't track it down at the moment. Twin Brens would also do.
Re the 20mm I haven't given up on that either lol, lol. I was having a look at the board and on the top rear section is the area where the Fishermen's Hut goes. It's smaller than the area I mapped out for it and behind it was to be the only part of the rear wall that would be seen.
I recon with a slight adjustment I can still show the wall but opening on to a platform on which could sit the 20mm. The positioning would be right for Anti Aircraft and Anti Ship Defence and might make a rather dull corner slightly more interesting.

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The final building use will probably depend on how the crane looks ground mounted as it's got to have a crane somewhere lol, lol. The idea of the building in the first place was to draw the eye down and into the harbour becuase the Lighthouse will totally dominate the whole structure so I need something else to add a bit of height and off set it. Now if there were houses on the Pier Road .....
Thanks for all the feedback and ideas.
Just working on the 20mm, a fire point for the Lighthouse and the crane. Never a dull moment lol, lol.
Cheers
Al