I mean for starters the depicted lines wouldn't allow for the gun to elevate/depress. XD Not without a redesigned mantlet and possibly trunnions at least.
Additionally, and I am basing this off of eyeball maths, it would also weigh more unless the plates were thinned, meaning a less balanced turret and thus less traverse speed (if any at all)
Turrets are really a big pain in the ass for tank designers, you can't just slap a box together and assume it'll work.
Turrets need to be balanced or serious issues come about, turrets need to ensure volume for depression/elevation, crew ergonomics, sight placement, and countless factors.
Maybe one day I'll try to actually 'engineer' a turret for a German hypothetical upgrade but right now it's beyond me to figure it out. X_X