I have three Leviathan models almost finished, all built using the Airfix 1/600th HMS Warspite, which I've called the "Warspout".
All are quite modified, with the propulsion system being aether screws of various sizes, all pod mounted on the side.
Version one is of a Battle of Britain H.M.L. Warspout in brown and Green Battle Of Britain colours (circa 1940) based south of Windsor, to protect the Royal Family and London.
Version 2 is of the Invasion Of Japan in 1946.
Version three is a non-British example, with WS at the end of its days, rusting, but defending Israel on the northern borders in 1956.
I'll post photos soon.