This is very odd indeed. I have no doubt it's an Ibanez - these guitars were made at the Fujigen Gakki factory, and the sparkly full-width inlays & very small dogtooth binding seem to be unique to their Rick copies. Also, as you say, there's no reason why someone would pretend it was an Ibanez if it wasn't!
So yes - very strange! I'm not an expert on these guitars, having never seen one in the flesh - but as far as I know, the Ibanez 2388 had a bolt-neck construction, while yours is glued-in. This is made even more odd by the fact that the original Rick 48- series had bolt-on necks:
http://www.rickbeat.com/modelslibrary/480/480.htm
http://www.rickbeat.com/modelslibrary/481/481.htm
I still think there's a possibility that it's been modded - someone with decent woodworking skills & tools could add the LP style bridge & tailpiece, and the scratchplate could be cut to take a humbucker. If this is the case, I think there would be some visible sign of where the original tailpiece was fitted, though, regardless of the modifier's ability.
More interesting is the possibility that this is a rare, hybrid or prototype model - these do turn up, very occasionally. I recommend you go over to the Ibanez Collectors World forum:
http://www.ibanezcollectors.com/cgi-bin ... discus.cgi
& post some pics & info on the Replicas (Ibanez Brand Only) board. There are some very knowledgeable enthusiasts, and even some former Ibanez/Elger employees who post over there.
J.