KH100 gearbox question

Hey everyone.
I ventured into restoring a KH100EL and being my first bike with no mechanical experience I did it backwards. In hindsight I should have rebuilt the whole engine to begin with and then dealt with making it pretty.
Alas, here it is: pretty but needs a complete rebuild. This has me in a position where it ain't gonna be worth much as it is so I may as well blow a whole lot more money on it.

So, as well as everything else in the bottom end, I need to replace the gearbox. The guy who has it apart tells me it is pulverised
. Does anyone know if the gearboxes in these varied a lot over the years or were they pretty much the same?
I ventured into restoring a KH100EL and being my first bike with no mechanical experience I did it backwards. In hindsight I should have rebuilt the whole engine to begin with and then dealt with making it pretty.
Alas, here it is: pretty but needs a complete rebuild. This has me in a position where it ain't gonna be worth much as it is so I may as well blow a whole lot more money on it.

So, as well as everything else in the bottom end, I need to replace the gearbox. The guy who has it apart tells me it is pulverised
