The XTA-34 is a self-propelled 200-mm howitzer, had double waiststeering. In first module placed engine and crew, in rear - only cannon and ordnance for it. Transmission was fully electric. Cannon have mixed design - tremo-electrochemical stage (hight density propellant and plasma ignition cartridge) added coilgun stage for improve muzzle velocity.
This one is a concept art for mod at C&C3 Tiberium Wars: Nod Revenge [link]