European MBT
AMX-40 with Leopard 2A4 hull. A kind of super LeoX or Leox2.
I like the idea of a secundary gun between 20mm and 50mm, in this case, Rheinmetall 20mm. In first option, it is installed coaxially to main gun; in second option, a full unmanned turret is merged with original rotary cupola.