@coachofmany:
Looks like the M3 will need to be smaller.
Maybe just a little bit. If you want it to be of similar size to the Japanese and German halftracks.
It is a little hard to judge the size of the ships from this picture, but it seems like the cruiser and maybe the battleship are pretty big. Not necessarily too big, because big ships are nice, but as I said it is hard to tell.
We have been through this a number of times, but a clarification on sizes:
Is there a largest ship type in your plans? As in heavy battleships and heavy aircraft carriers are of approximately equal size and are the largest ships. With ships like the Yamato, Midway and Montana(?) being produced should other ships be smaller? It looks like that from recent sets and in this picture, but I did not know if there was an explicit sizing rule that HBG is using.