Hey mate, seen your PM and will get back to you, but just like to say publicly this is awesome and i will definitely give you any help i can! Having some of the old domestic teams would be awesome, and imagine playing a career mode in the 80s with the retro filter on!
As a quick heads up, it's worth checking some of the all time teams, and other historic teams (someone has done WSC teams for example, and i've done the South Africa rebel tour teams) as you might find some of the players you need already made (probably a small percentage, but every little helps!) and looking at how disparate creators have skilled/attributed some of those players might help you too.