OK, thanks Giorgio, that's pretty much what I had thought. I've got a lot of "G" kits in my stash (I like to contrast and compare across various brands) and I came to the realisation a while back that unless I stock up on a lot of the Hasegawa and/or Revell kits then I was going to be building a lot of Japanese and Canadian examples.
I wish some third-party company would offer a proper "G" accuracy set to convert, say, the ESCI/Italeri kits ... CMK came so close with the various detail sets that they offer but apparently lost interest by the time they came to the undercarriage. Those bulged doors are not an easy thing to scratch! -- at least not with my skills.
Until very recently you couldn't even get replacement wheel sets, but Armory and Reskit offer sets now for pretty much all sub-types.