This has started to rekindle my interest in the circular ships (as if I hadn't got enough on my plate...)
I guess that chain ferry would be a lot easier to build than the Novgorod, a semi hidden propshaft would move it along, much easier than all those shafts in the Ruskie. A bit of fiddling about and those chains could be made to move as well, which would look good...hmm.
I think a strong black coffee is needed, Barry...