Great stuff!
I've got the same Old Glory organ gun, like you I replaced the solid wheels with spoked ones, but I chopped the dragon-heads off completely.
I'd considered getting the Old Glory 'culverins', but thought they were quite a bit smaller than the Perry ones. Your pic shows they aren't really, and are actually very nicely detailed. I might pick them up next time I'm at a show.
But then who made those two really tiny ones, the green and brown ones?