bandai has been doing the clear kits since they started doing gundam kits. There meant to show the internals, as well as being special edition kits. There exactly the same as the normal kit except for clear parts.
They have clear versions of all the endless waltz kits.
PG zaku II and Gundam,Mg Gundam and Zaku, Vintage gundam (Cant remember 1/100 or 1/60), and a few more I cant remember.
There just special edition, like the metalic versions, the pearl versions, and the ltd edition ones (like the qubeley set, I have all but one, well I have all 3, but I built one, I want it again but not opened)
Funny, I just saw your post of this on bakuc. I didnt realise you posted here and there.