Harold: I hadn't realised quite what a difference there was between the pure flying boat and amphibious versions of the Catalina, in terms of the landing/beaching gear.
The tunnel gun was a bit of a surprise when I first saw it - the Revell kit has the hatch as a separate part, but no indication of what its for. If I hadn't stumbled across the HPH cutaway Catalina, I'd probably never have guessed. I'm not sure it would be one of the more comfortable gun positions on board, though.
It's looking good, how much nose weight did you need to use in the end?