i dont think it should be anything variant specific.... i.e. GTR's GTS-t's etc. NOR model specific i.e. R31, 32, 33, 34..
I reckon a more generic approach would be more popular..
maybe something which all skylines have... a distinct feature.. like the round tail lights..
or something even as simple as the "S" logo..
and then references to the website to create awareness etc.
Just my 2c.
Thats a very valid point, but i'm more like these people in that i'd rather wear something which applies more to my situation.