I'm not against an EV conversion, because the old hot rod addage of 'run whatcha brung' doesn't mean what it used to mean in today's world. However I think this is an excellent illustration of what happens when you don't follow the steps needed for a proper conversion. Just like back in the day when a poor conversion would fall apart due to bad welds or whatnot, this conversion fell apart due to failure of giving the components what they need to function-ventilation and cooling.
Just glad no one was seriously injured, and the cost was just a truck and some underpants.