bro, sorry to say this, but your facts are wrong. chassis for waja was derived from mitsu, but there was more than enough expense, modification and R&D gone into it that it is recognised by the automotive industry as a genuine proton platform.
after waja, the only thing that proton used from other manufacturers was renault 1.8 engine/gearbox, mitsu gearbox for campro engines, and renault 1.2 engine/gearbox for savvy.. you're looking at 90% + locally...