[throwaway76543]

Honestly what I'd like is a safety oriented cabin designed to minimize whiplash. Restrain my head and neck, surround my body with impact absorbing material and put a screen in front of my face and a keyboard within reach of my hands and we're done.

I don't want a large void space inside the passenger area of my car at all.

[dsfyu404ed]

All those things exist. A HANS device, a good bucket seat and a good harness do what you're asking.

[throwaway76543]

I'm looking for more than a strap and a seat. I'd like the entire interior space to be repurposed to absorb impact energy.

[jaxtellerSoA]

Yeah, that will sell real well, especially to all the claustrophobic people. "Here sit in this moveable coffin". No thanks.