If they want a test vehicle I'm willing to pull out my LiFePO4 cells. At 100 times the energy density that would give me a 120kWh+ pack! Except at the energy density levels you're talking about batteries and the EV drivetrain have better effective energy density than an ICE system and you don't need to redesign anything. I took an ICE and put in an electric drivetrain and battery pack and ended up at the same weight as the original vehicle, but I only have 12kWh's of storage. If I can do the same and end up with 120kWh's of storage at the same weight and same space nothing needs to be redesigned. That goes to my point that if energy density is high enough and cost is low enough you don't really need to do anything special to design a good EV.