Trumpeter does make a 1/700 Yorktown-class carrier, the Hornet. I've never encountered a review of it; I imagine it's largely a scaled-down version of the same company's 1/350 version of the same ship.
I did recently buy the Trumpeter 1/700 North Carolina, and am very impressed with it. It can easily stand comparison with the Tamiya Iowa-class kits, which really do represent the state of the art as far as mainstream warhip kit manufacturers are concerned. If the 1/700 is as good - or even nearly as good - it will be a major improvement over the Tamiya versions. (My big complaint with the ladder is their skinny islands. It's a mistake that most people don't seem to notice initially, but when it's been pointed out it becomes ludicrously obvious.)
Unfortunately there were quite a few differences between the three ships in the class, with the Hornet having particularly obvious differences from the other two. (Her flight deck was shaped differently, and her island lacked the odd "gap" in front of the funnel - a feature that all manufacturers of Yorktown and Enterprise kits seem to have missed.) The Tamiya kits are pretty old now; they represented the state of the art in the late seventies, but such things as their 20mm guns show their age. Maybe it would be possible to combine, say, a Tamiya Enterprise and a Trumpeter Hornet to make a really nice Yorktown.
Has anybody out there bought a Trumpeter Hornet?
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