Sort-of. What I'm imagining is a small selection of vehicle sizes from small hatchback to estate/people carrier to van/kei-sized pickup that have a common battery pack size, motor, and inverter.

You'd choose the type of vehicle that has just the basics built-in like safety and AC.

The rest is customisable and allows for 3rd party manufacturers to make ancillary products for it. Do this by using existing standards for 3rd party automotive parts and then create new standards with open sourced designs for things that aren't: i.e. the battery pack size and interface, and inverter size and interface.

Eventually what I'd like to see is a market where people can keep these vehicles running by upgrading, repairing, recycling.

If I had a billion dollars laying around I'd sink it into trying to create an automotive co-operative to get at least 3 different sized vehicles with a common battery, motor, and inverter made, through certification, and then released. Then let the market do it's thing when presented with a new opportunity: adopt and grow.

And I know that I'm certainly missing a lot of issues with this idea but that's just what it is, an idea and it'll probably stay that way unless someone else has the resources to make it.