We miss you Kurt. Personally I learn't a lot from your test lab. hope you 'come back' with some killer maxwell animations in the far off future.
Petero, you could model the polycarbonate sheets but with two layers of transparency it will render slowly. Here is a diagram of a quicker way to get a similar visual effect;
So you are embedding the ags single sided geometry inside the 'glass' type geometry, no special gi flags are needed.
Hope this helps, this material is very tricky to get right, because you need to fake it to get fast results. (Light coming through 2 layers of transparency will render very slowly especially under sharp lighting - this is called the caustics of caustics problem and is yet to be resolved by the bods at NL.)
P.S. I'm not sure which shape is best for the AGS geometry, perhaps just single skin vertical fins would work, maybe you can give us some feedback about that.
EDIT: It might be worth trying another technique; you could create 2 planes of a thinsss material (use assym around -0.85 and very little scattering) with an ags material (one bsdf with roughness 10, r0 dark blue (in this case), and one gloss coat bsdf with roughness 2 and force fresnel) for the fins. I think that would also render efficiently. I've never tried to make walled polycarbonate sheeting myself because its never been requested by a client.. yet.
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