Heh, cute. The only way to improve the historical reference would have been to draw them in actual Flakhelferin uniforms, but then I suppose it would be much harder to tell it's actually Lebe and Max. :)
Speaking of which, I thought the 88 was part of the AA suites for the German ships including these two destroyers?
I don't think so, no. The 8,8cm Flak 18 and its descendents were very versatile, and spawned an entire family of guns for different tasks, but I'm pretty sure the Kriegsmarine didn't use any of them. They certainly didn't on the Type 1934 destroyers; those ships' main battery guns weren't a heck of a lot larger than that (127mm). :)
I suspect the 88 would've been overkill for shipboard use, since ships generally weren't trying to defend themselves from high-altitude strategic bombers (and that's what the 88 was primarily meant to shoot at). Not that the Germans were wont to shy away from overkill in selecting weapons systems, admittedly, but still - Kriegsmarine ships mainly had smaller 37mm AA guns, which would've been more wieldy when trying to fend off close-range attack aircraft.
(Type VII U-boats did have an 88mm deck gun, but it wasn't part of the Flak family - just happened to have the same caliber bore.)