Thanks guys!
I removed the original window surround, then cut a pair of louvered inserts from Evergreen 0.040" clapboard siding. A little sanding to refine the fit and some careful bendding to make sure they fit the openings as tightly as possible, then installed them with Tamiya extra thin cement to really seat them.
"ROBIN-1" is by far the better known license plate, but the pilot episode Ferarri with its older style "56E-478" is what I always think of when I think of this car. If I find (or decide to make) the later GTS, it will be wearing a "ROBIN-1" plate.
No, the kit itself was actually very good. I may have wished for a better part breakdown to make painting easier in a couple of places, but really nothing to complain about.
Cool!