I really love the original and this one looks right to me. I've wondered if the original is as early as suggested, because it looks "fully evolved" to me, not as robust feeling (even though it has a very large buttplate, it seems sleek) as the Marshall or Faber rifles, or even Oerter's work, which hint strongly of being close to Germanic roots.
I think that Shumway illustrated another gun very similar to this one, suggesting it's not a "one-off".