So the ability to close within x miles of the shore (and top speed) will mark the difference between the CV and the CVE. Capacity won't be a factor under current modeling (and likely won't be in future modeling since its a a play/fun limitation - besides, CVEs will get more players upping to take bases in the MA). There's been discussion of separate types of Task Groups before. To accomplish this vision with the least amount of modeling but with distinctly different U.S. and Japanese forces we would have (IMO):
A U.S. CV group (Essex class CV, Pittsburgh class CA , Fletcher class DDs) [our current task group]
A Japanese CV group (Shokaku class CV, Myoko class CA, Akizuki class DDs)
A U.S. CVE group ( North Carolina class BB, CVE class [or converted oiler] to be determined, Fletcher class DDs, landable craft - and PTs?)
A Japanese CVE group (Nagato class BB, Hosho 'class' CV [closest ting IJN had to a CVE], Akizuki class DD, landable craft - and PTs?)
A U.S. BB group (Iowa class BB, Pittsburgh class CA, Fletcher class DDs)
A Japanese BB group (Yamato class BB, Myoko class CA, Akizuki class DDs)
That would be nine models (eight if we ignore the DDs but more if we shoot for uniquely Japanese replacements for the landable vehicles and PTs):
However - Japanese landable vehicles and 'PTs':
Japanese type 2 Ka-Mi (Amphibious tank - 37mm)
Japanese Daihatsu-class landing craft
The closest thing I've found to a 'Japanese PT boat' is the Shin'yo class suicide motorboat. The Japanese had 'Patrol boats' armed with AA guns and depth charges.
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This would be quite an undertaking compared to modeling 2 BBs and one CV (but could be the end result if the community showed more interest in the new ships modeled and it, dare-say, attracted players interested in WWII ship v ship stuff).
P.S. I think it would pretty much require rotational (and likely randomized) spawning of Task Group type/nationality in the MA. I suggest randomized because that might possibly cut down the intentional risking/sinking of groups because a player's preferred group is next in the rotation.