You could pick up the lexan from a local home depot in the proper thickness and cut it to shape with a jigsaw using your original side window as a template.
The NACA duct, you could pick up at a local racer parts store.
What is the puropse of the vent ? Oil cooler ? more air to engine ?
I noticed you are in Toronto ... check out the Boxer AutoGruppe forum .. we meet in Oakville second Tuesday of every month for beer, wings and VW chitchat.
Sandeep
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