I had this idea in the back of my head to create an open source electric car based on existing ICE cars and with open source software, mechanics and electronics

I had this idea in the back of my head to create an open source electric car based on existing ICE cars and with open source software, mechanics and electronics. That would be awesome if anyone can change/adapt build plans to different cars and if anyone would be able to iteratively improve the each other ideas and cost saving measures.