The old Ajr's were only different than the rest of the A lineup, in that they had fewer frills and appointments, they all were designed and assembled the same basic way...no different than the Model 1 Gilchrist pic that Jim (Garber) posted or the Gil Model 1jr's shown here in this thread...some just got more bric a brac. The dudes and the nuggets have the same kinda neck joint as do most F5's made by today's modern makers. People simply get confused when they see the ramp on the top plate of my Gil F5Jr as opposed to the underside of the fretboard. So when people scratch their head, it's easier to explain in the context of an old A design although, Steve told me that the ramp most closely relates to an early lute.
Here's a pic of a Gibson Loar-era tenor lute owned by Ken ... looks suspiciously similar (see ramp) to my Model5jr. When I first asked him if he could do a 5Jr, he said he'd been noodling the design of one for some time, so I know lots of thought went into it. I think it was a brilliant idea, quit lively and frisky and plenty of volume.