@CWO:
Although they’re scaled too big for use in A&A, Navwar has a huge array of 1:3000 scale cast metal warships (WWII and other eras), including some classes which were projected but never laid down or completed.� Â
http://www.navwar.co.uk/nav/pdf/webcat.pdf
http://www.navwar.co.uk/nav/default.asp
I own a small fleet of Navwar WWII-era battleships, though I’ve never yet gotten around to using them in a tabletop game.�  I’ve supplemented them with some epoxy WWII-era carriers from Panzerschiffe.�  They’re a bit larger scale (1:2400) than my battleships, but the difference isn’t too noticeable when they’re side by side.�  Navwar has carriers too, but I got the Panzerschiffe ones because they’re less expensive; my main interest is in battleships, not so much in carriers, so I didn’t bother to invest in a metal carrier fleet.
http://www.panzerschiffe.com/
I actually have a fair # of Navwar & Davco ships in 1/3000 and Panzerschiffen in 1/2400. Â (I basically have 1 of most of the key ship-types for each CA, CV, & BB, though my Navwar range has some gaps, as I found them a little hard to get ahold of over here across the pond…)
But like you said, they’re too big for A&A. Â I also tried 1/4800, but they’re too small. Â One would want a true “Super-BB/ CV/ CA” to be noticeably bigger, not a little smaller than the standard type. Â I suppose if one replaced entire navies it would work, but I haven’t been ready to seriously contemplate this yet… I remain hopeful that HBG will come through with a few more of these and then we’ll have a range sized just right…