Pretty sure it is a 1983 frame. Look at the rear axle, one shock forward, one shock backwards. Only 1983 had this set up.
Doors are 86-87, lift up but no capping and roof is even later (, looks like flat and vents in the back) and no alpine windows. Doesn't even come on any 5 door like this.
More like a bunch of parts put on a 1983 frame.