Check out this site. For $130 you can get a full size plastic replica.
http://www.foxflier.com/lewis/
In Canada these "non-guns" are prohibited. I think I'll take a stripped Lee Enfield
and dress it up with this plastic stuff and have a legal Lewis look-alike. If I do I'll make a Lewis style butt stock and pistol grip so it won't break. The Enfield action would still be under the plastic so it might be possible to have it firing too. Just a thought.
It'd sure look good on my Motley mount.