Back in Juneau, Alaska, in the late 70s and early 80s ... before SkyWave's 1:700s ... Dave Hammock and John Foster used to run naval miniatures games in the basement of their 1st Baptist Church on Old Glacier Highway ... having to sail/battle around the steel foundation columns. The only thorough line available at that time was for the Japanese ships, of course, leading to "desperate measures" to fill in the other classes. (Indeed, the mail order houses in the Lower 48 blithely disregarded their specifications for the full-gun-armament 1942-era variants of the destroyers, leading either to game delays or hacked armaments too.)

These included "waterlining" the old Hawk/Testors "World War II Destroyer" -- basically, a Revell SULLIVANS down-sized to slightly larger than 1:700 -- which was extremely difficult because of its shallow draft anyway, leading to some very jagged/hacked sawings.

The 1:600 full-hull line of British (and a few German) ships was thus dragooned, but the significantly larger (nay, elephantine) scale looked so ... and there were those hacked waterlines, again.

John (and I think even Dave) attempted some balsa from-scratch wood models -- John did a quite nice SALT LAKE CITY, actually -- but most of them looked ... primitive ... alongside the plastic kits of whatever scale.

This was one of the main motivations for me doing my cardstock models ships of the U.S. SIMS class pre/early-war destroyers, and the British L&M and L/AA class. I was going to do the entire Italian line too, but the desire to do American and British destroyer and cruiser classes has intervened. And those perversely flared light cruiser bows are a nightmare. Plus, the resin kits now out give modelers/gamers another alternative, if you don't mind hull warpage by the resin ... and I wonder if it gives off these fumes like those of soft plastic toys, now credited with diminishing male fertility from a young age.

Maybe now that I've stopped the Iraq War, I can resume normal life ... and game and model ship designing.

AND, we have SkyWave and even Tamiya coming out with proper injection-molded 1:700 kits of more non-Japanese warships. (But you would think Tamiya would come out with the distinctive HIPPER version of the German heavy cruisers. Anyway, ...) But the new molds/kits are extremely expensive, and discourage mass-acquisition for game scenarios (vs. my cardstocks which cost about 10 cents per ship ... NOT counting time/labor which could be spent gaming and more designing).

So, NO, mixing 1:600s with 1:700/720s -- or 1:2400s with 1:3000s -- is NOT good, Virginia.