I actually lay awake last night mulling over the practicalities of a Zummy. As usual with these modern styles of warship there is a very high superstructure, but of course making the boat slightly larger would effectively decrease the structural weight a bit by "thinning" the sheet material down for the scale.
Bulkheads could be Styrofoam to save top-weight, access via deck hatches. Make the below water section a bit deeper to provide more stability/ability to add a decent amount of ballast. Seems to have been fitted with conventional props so nothing difficult there. Balsa gun turrets, card "hatches", man made board patches for the radar or possibly 1.5mm ply. Foam helicopter unless something commercial is available.
About 4 foot long, the size I have settled on as being large enough to be ..not small… and to fit in the boot of the car.
The entire thing seems to be all straight lines. I have no doubt that I could construct a shell in three or four sunny days no probs using superglue (which is great for man-made board, as it penetrates through the material strengthening the joins wonderfully) and 5 min epoxy for the foam structure bits.
Ashley