I concur, the Austrian/Italian Naval race ended up with no really decisive battles and the Austrians maintaining a fleet in being and occasionally one side bombarding the others coastline. All the central powers navies should definitely be in it. The USN should be included along with the British, Italians and Russians for commercial reasons even if it did very little, and if you are going to do that adding the IJN isn't a huge stretch.
If Monggose are no longer as tied down by page restrictions as previously, I favour a book big enough to fit everything plus a set of historical scenarios, what ifs etc in rather than limiting it to one main book that covers some bases and then have people slavering for an expansion as is currently the situation.
And Oggie, are these ships in 1/6000 it looks like a lump of metal from over here and If I sneeze its a tropcal hurricane scale or 1/3000 Navwar. I'll be putting a Navwar order in next week, did you want anything?