[ChrstphrR]

Ah, gotcha - if you're going with steel or hybrid steel-AL oilpan, yes, the fancy skidplates won't be needed. I'll carefully stick to plate referring to the flat bits, not the oilpan to reduce confusion.

I'll still advise against trying to hunt down the MkIV plastic cover for your aero-smoothing. It's meant for MkIV mounting points which are a different animal from the MkII.

And, you'll likely have to add wings anyway, like COCyclist did on his, to cover the bits the cover anyway. I did too, for that matter: I made a perf-steel equivalent for my MkIV, with the added wings between bumper and inner-fenders, with the intent of coroplast skinning it later. (I've been remiss on sorting the photos, putting the measurements to CAD as intended... Sorry! And it's a different chassis than you're intending to use).

You could probably fab your own bellypan cleaner looking to both air and eye, as well as lower cost than adapting stock parts to a different chassis -- even if you're sourcing the part from a salvage yard.

Save your money for more durable plastic than coroplast, perhaps, but there's no way a basic sheet of plastic is going to cost as much as that OEM part new!