Thought I read somewhere that Kimi struggled to get in and out of the cockpit with Halo device.
Apparently the 2017 version will have a hinge fitted to it. One of the criticisms of the fighter style cockpit canopy (the better looking option) is that it's hard to open if the car lands upside down in an accident.
Given that the Halo is meant to have a hinge, I can only imagine that it needs to lift up, so won't that make the Halo useless in a similar event?
I reckon you can have a canopy that slides open like a Mustang P51. The chassis tubs these days are table top flat . A simple rail installation will enable the canopy to slide forward. A roll over hoop above the steering wheel area but outside the canopy, ensures the canopy will have space to slide forward if the car comes to rest upside down.