Could Justo specify his source for the three-view in the first post? Did he use photos of a mock-up? Period artwork which could give the design some validity?
After searching unsuccessfully the Taiwanese web for the words "Lockheed", "AIDC" and "LT-21", I'm strongly inclined to believe that this is a fake, but of course I could be wrong.
As for the 1946 competition that spawned the Gloster and McDonnell designs, it seems much too early for such an advanced design (much more akin to the Douglas Skyray).
We definitely need some genuine documents (even a poorly scanned illustration from a magazine of that era) if we are to accept this as a genuine project, especially since no-one else here seems to have heard about it.