I've altered RM
Aries to allow for a crane amidships. She is just a single vessel. She does/will have 3 newer sister ships with new pattern 10" guns and turreted secondaries. These are the
Ulysses class. There is a picture in
this thread. However the specs are wrong. I prefer the look of
Ulysses to
Aries due to the raked funnels and shorter superstructure.
I was going to use the Maachi M.18 flying boat.
17m span, 10.9m long and 3.66m high
I reckon it will be fairly close, but it should be able to fit in at a pinch. I think the wings would need to be taken off however, so it isn't going to be a quick launch/recovery.
Some details can be found
here under the 1922 section.
And there is a picture with the M.18 mounted on a MAS da 38m
here a little bit down the page.