I mean, the vast majority of parts for the vast majority of cars can be ordered from:

https://www.rockauto.com/

Ordering parts feels like less of the issue than the ability to fix and service it yourself.

Has tesla started supporting third party shops doing battery replacements for instance?

How can you replace the idiotic console and door handles with manageable parts? Is there a sane charging port yet?

You want to add a load of buttons? Should be easy enough, just get them to send codes to the computer via the network.

Door handles are harder, what do you want to change? Inner or outer?

What's insane about the charging port?

Don't they use the same IEC 62196 ports as other EVs, outside the US?

They made their own in the US, because the standard SAE J1772 combo port is an unweildy behemoth, then they released the patent into public domain, and the rest of the automotive industry adopted their port into the NACS port, which beats both IEC 62196 and SAE J1772 in available power, all in a much smaller and easier-to-use connector.

Yeah the 62196-2 connector is standard in Europe. It's not legal to sell cars with a nacs connector and hasn't been for a long time.

> Great, who can I contact to get this done?

Here you go, add as many buttons, dials, knobs, and screens as you like for your Tesla...

https://www.enhauto.com/collections