What the hell is this?

Yeah, the styling should ideally be based on a hardtop, not a sedan, but there is no room for rear quarter windows, so you'd need custom door glass with a rake to the rear edge to match the hardtop roofline. A full hardtop B pillar would eat up more of the bed space, so you wouldn't want a sloped rear glass like this one has -- you'd want a vertical glass with sail pillars -- which means a lot more metal fab. Still, they did a fairly tidy job on this, but the side window looks odd and the whole greenhouse looks too short.