That's really starting to look like something. But what's the rocker arm with the ignition switch doing behind the driver's seat?
If the regulators truly don't care, can you get it licensed without any body panels, like an Ariel Atom? Or shrink wrapped with cling-film?
Were I faced with putting doors on something like that, I'd look to 40s Buick or early 50s International hoods. They had a combination latch and hinge on each side. You could open from either side, or turn both latches and lift the whole thing off completely.
Here's a drawing I did in the 60s [the bottom one]:
