Aircraft pitch more than ground units, so if anything it's even LESS possible to have a aircraft with more than one gun.
Well, you can animate a turret. Only in pitch OR in bank, at least it's what
I found out. Of course the 'usti hlavne' and 'konec hlave' points will remain
where they were, so this is of little utility other that aesthetic.
take a look at this if you don't believe:
http://s8.yousendit.com/d.aspx?id=5B5DC178CDB6B293D0221055CC6773E8(link will disappear in three days)
Returning to the abrams tank above, you could make the turret ring solid
with the tank itself, and make the turret having only the weapon with the tripod
and the hatch (along with the gunner, of course)
For WW2 tanks that have mostly internal machine gun, this should be
even simplier, cause there would not be visible moving parts except
the barrel of the gun itself. Infact if you place the gamelogic that keeps
the weapon attached to the tank carefully, that is in the point where
the weapon is supposed to rotate ( a limited rotation in any case, cause
a MG in the hull or inside the main turret cannot rotate too much anyway),
the illusion should be almost perfect.
Also, don't take the abrams I've made as a complete addon, because it's
not, it's only a demonstrator. So you won't use it in your mission, but only
try it out to see how it could be when someone more talented than me
will make it a complete addon.
Every so and so maybe you'd wish to redownload it from this link:
http://xoomer.virgilio.it/sa8gecko/M1A1_turret.rar (the same as above)
as I keep adding features when I have the time. And I hope someone
would like to help too, cause this is an open project. About the features
that could be replicated even in 'normal' addons are the MG turret firing
4 AP and 1 tracer (works only with the AI as gunner), ricocheting tracers
and expended cases ejection.