The Bristol Fighter was the Brisfit (designation F.2A or F.2B). It served on well after WW1, dropping bombs on Iraquis (some things never change).

Neil - that would be a Vickers Gun-Bus (FB5).

You get get a wide range of injection-moulded kits of WW1 aircraft from smaller manufacturers over here in the UK, and presumably elsewhere in the world. There are also vacuum moulded kits but these are quite a bit harder to build.

LH - the nearest thing to an ornithopter would be one of the German 'Taube' monoplanes, wing-warpers with a very bird-like wing. I'm sure you could find a kit for one somewhere.