If it has never been airworthy, it's called a mock-up on A.net I've been told. I'd do it like this:
Generic: Royal Aircraft Factory SE-5
Version: Royal Aircraft Factory SE-5a (mock-up)
Chile - Air Force
PROP, MILITARY PRESERVED
Many thanks, much appreciated ! Already uploaded, so in a couple of days we'll see .
Btw, I looked up in Thierry's upload guide but found nothing regarding replicas (or mock-ups), so maybe it would be a good idea to include it.
Just sit back, relax and have a glass of Merlot...enjoy your life!
Actually, I wonder why mock-ups/replicas are accepted (and that is not an attack on any of the great pictures in the DB but on the fact that mock-ups are not really airworthy and have never been). I say this because simulators are for example not accepted but do basically the same for the viewer. They show an aircraft without actually being a real aircraft.