That kit's an oldie but a goodie, eh? I remember building it as a wee lad in the early 70's. Beautiful aircraft. I think I blew it up...sacrilage!
Not to fear, I now have the 1/144 Academy B-47 B/E kit waiting in the wings.
Did Hasegawa also release a B-47 in 1/144 years ago? I know the 1/72 kit is quite old, so if it was based on a 1/144 kit, it must be from the late 60's or so.