This is Neil Blanchard's CarBEN EV5
If the outer 1/4s of the body were permanent and the middle 1/2 hinged open like this, it could create what's called a
trolley top.
Else you could use a combination latch/hinge, two or three to a side, that would act like the hood on early 50s International trucks or late 40s Buicks. They open from either side, or you can flip all the latches and take it clear off. I used the idea in this dune buggy design:
You'd want no more than 1/2 to open this way.