I think the clear gelcoat (and textured gelcoat even more so) may cut the output more than you would expect. I say this because I talked to the architect of the local botanical gardens' big addition, and he explained that they had to use single-glazed glass instead of double-glazed because the extra layer of glazing would have meant that all the plants would starve to death in the winter. Who would have thought a layer of glass would substantially reduce insolation?
Not to say that it's a bad idea, you just have to overbuild the capacity. Pretty cool, imo.