Yeah I don't mind helping out.
Chances are I've already translated the catalogs since I have a collection of catalogs from '76-'86 here at home.
Granted, I only translated the specifications of the guitars in the catalogs. I never tried with the flavor text and I'm not sure I could translate that, it's a bit more advanced than my current level of japanese.
I have a list of 247 different MIJ Aria Pro models and I have specs from japanese & american catalogs for 180 of those. It would be a few more(20ish) if I didn't give up on the project.
I'd be happy to supply this info if wanted/needed.