Don't your legs stick out if you try to hide in the turret?
Depends on how you lie down, probably. As you can see on this picture:
the tank has a pretty thick layer of plate at the pipe, soo he probably lies with his leggs in that position and the people outside can't see them sticking through.
The 222 isn't bad at all, but as you said you're to vulnerable, because you can't close the hatch at the top.
In my opinion they should change that like you can take window up and down on kübel, roof up and down on willey and plate covers in commanders veichel.
And ye as you say "you can't shoot spitfires" <-- cant that be fixed with coding? Also, its useless for taking down spitfires anyways
Coding example (remember i know nothing about coding) if you move the pipe up, the roof opens, if you move it down, it closes.