Personally I would fabricate for the sills. The sills on car 1, when removed, will reveal the rust inside the sill. This rust wont have reached the outside just yet. If its a track car, I would just get into it with some 1mm high carbon plate steel and a mig (dont get the crappy rusting steel used in holdens n fords, and gal steel is a PITA). As for the plenum, im not exactly sure about the rollas, but if they are the same as the RA40 celicas, they would probably be best off cut and plated, with 1.5mm plate around the hinges. They tend to rust down where the base of the hinges are, and you will probably find inner rust in car 1 when you cut it out. If looks arent a problem, and your not a complete numpty with a welder, then DIY FTW.
Cheers, Owen
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