I thought a previous poster here meant the mould "Is Gavia" (see post above). Sorry about that.
As for the comment that 1/350 ship kits are worse than 1/48th aircrafts, that is almost too absurd to elaborate on... I've just noticed today that my Hasegawa 1/48th FW-190A-5, the best FW-190A kit there is, and my best effort so far, is STILL low on its right wing and is thus crooked, despite huge extensive efforts to raise that stupid right wing to match the left wing (AM's Il-2 is similar but even worse)... This after experience on at least four previous identical kits, and carving and bending the plastic extensively to raise that right wing...:
Oh, and you can't see it here, but the fin originally also comes twisted to the left (on all 8 kits I have seen), but was bent straight here, so what you see above is not as bas as what it actually looks like OOB...
This may account why 90-95% of aircraft models I typically see at shows are not just crooked, but badly crooked. This has gotten worse recently: On my last show, there was not a SINGLE straight tailplanes-to-main-wings aircraft in all the 1/48th categories, around 50 kits in all, including one of the two I brought unfortunately (my tailplanes did match, but it was the main wing itself that was crooked)...
Don't judge ships by what Trumpeteer brings out: I've assembled four Hasegawa and Fujimi hulls so far, and they all have SIX to TWELVE bulkheads for the sole purpose to ensure stiffness and straightness: When was the last time you saw ten solid bulkheads in an aircraft kit to ensure symmetry? Not one of these hulls has turned out crooked so far...
As far as details go, even a 40 year old Nichimo 1/200 Destroyer has detail that makes most recent aircraft releases look like they originated from the stone age (although I found out the one-piece hulls of the Kagero and Yamato to be assymetrical: Nichimo's two-piece hull kits are fine)...
For that matter, Revell's 1/196 Constitution, a mould dating from 1956(!!), is perfectly symmetrical and has layered 3-D overlapping plating detail that has had NO equal since... Let me tell you: Aircraft surface details have a long way to go to reach the level of ship kits of the Eisenhower administration...
I'm guessing the people at Zoukei-Mura noticed the inherent, and terminal, crookedness of most thin-skinned aircraft kits, which is why they went for the full internal structure... The way around that is to mould the skin in thicker plastic, which Monogram understood well enough to do in its day, with thinness just around the open edges... Good sound thinking... Although they made quite a few unfit-to-fly assymmetrical "hangar queens" of their own, it had nothing to do with their basic concept...
More often the trend has been towards thinner-skinned aircraft kits, which means that in many cases the crookedness has gotten worse (and this even in Tamiya's 1/32 kits, if what I saw at shows is any guide)... If not because of the kit alone, then because of the builder or the complexity of the multi-part assembly... Here, on this 1/48th Ki-61 (by Boroda Rus), it is the kit's fault, and in several Ki-61 kits I have barely managed once to get that left wing top straight without causing a dimple or twisting the trailing edge:

It is basically impossible to get that wing straight...
Which reminds me of the wonderful Hasegawa Stuka, and its mould-ballooned wingtops, too much of an unfixable classic to pass up:

Mind you, I will still make the extraodinary claim that there are a few inherently straight aircraft kits... Now let me get back to you if they are also accurate on top of that...
But of course, no one has noticed this, so rest assured this means it doesn't exist at all: I am just making things up, and therefore I look forward to see table-fulls of crooked aircrafts in future shows for decades to come... Fortunately I'll be in the ship aisle by then...
Gaston