There was once kits available to make a 'vert out of a truck.
Really popular in the big mini truck craze in the early 90's. I recall seeing ads for the kits in Truckin' back when I started reading it in about 1997. And back then, I thought the look was dated. lol. The modding was probably done when the donor truck was brand new.
In regards to it looking "unfinished"....it's the way the kits were done. Required less cutting and you don't have to worry about having to make that big long straight cut under where the back window used to be. And...makes for clean install of the soft top.