Round lights on a 1200 would be very cool, although I wouldn't use a different color back (as in the 120Y picture here). In the US, multiple round tailights are a Chevrolet or Corvette styling pattern.

Another idea would be to extend the stock-type rear lights clear across the back.

What like a Shelby Mustang ?????

I was actually thinking more of the appearance of a one-piece tail light. The Shelby Mustang rear lights are like the California Special Mustang (two separate lights, but very wide):

California Special Mustang
Shelby Mustang
Come to think of it, having sequential lights (turn signals that flash outside, middle, then inside bulbs repeatedly) would be very cool.

Here is a picture of a Nissan treatment (although this is more chrome than I prefer):

California 510
California 510 #2
Is this a factory 510 JDM taillight? I've never seen one like this before ...

Japanese Datsun Sunny Excellent 1600GX Coupe (B-GB211)
These are the Japanese Sunnies that people talk about with the L16 engine in them I am taking it?

i cant believe these words are leaving my mouth (hands? whatever) but

that 120y looks half decent!

ewwwww that felt horrible even to write

Yes indeed it's a 120Y :) But cooler.

I saw one of these rear panels for sale at the Datsun Shasta meet in 1999. The same dude had a Datsun catalogue book with pictures of all the Datsun models. It wasn't for sale though.

Chris.