Ok so I'm thinking taillights.
As cool as the original taillight thing is, I'm not a huge fan of it. It faces upwards, not back as it should. It looks like a police beacon, or like it belongs on a 1940's rendition of a UFO. It doesn't give me late '50s/early '60s vibes. I think I want to save it on a shelf and do something else with the space for this build.
This is the panel/area I have to work with:
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My dream, if I had unlimited resources and Chip Foose-level metalworking ability, would be to somehow put some miniature version of mid-'60s Impala taillights in that little vertical panel. Ideally, I'd have a concave aluminum insert like the '63 to set the taillights into. Here, have a laugh at my MS Paint-level renditions.
1963 edition:
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1964 edition:
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Coming back down to reality, I decided to cruise the Headlights and Taillights gallery in the Show Me Your... forum for inspiration. This one jumped out at me:
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I'd go shorter with the tubing, but I'm wondering if I could incorporate a couple of exhaust-looking pieces like that to set the taillights into. The brainstorm continues.