Change of brand is totally illegal (Proton to Mitsubishi). Change of engine from different brand is also illegal eg. Saga with B16A. But change of model from same brand, I guess no problem but JPJ has guidelines.
Change of engine from different brand still can proceed but you must facing so many procedure to do it.Last time I have helped my father to convert his hyundai trajet to mitsubishi airtrek turbo include tiptronic gearbox.
But for bodyworks approval I don't have any idea.
For me I think better if you want to fully convert to evo7, you follow exactly like Kancil become Mira procedure because you can easier to pass no need to face so many regulation.
1) Convert the engine and gearbox first.
2)going to inspection
3)convert bodykit
just my 2 cents opinion.