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More than anything, I'd recommend doing something with the cooling jacket (on the barrel).
A lot of old-school machine guns were water cooled- maybe ding up the jacket a bit, add rust/corrosion/verdigris/tarnish spots and/or streaking where the cooling system has leaked..
Maybe a small hose to a coolant reservoir.
Just a couple of thoughts.
that's quite the monster you have there... i wonder if it will still work once done....
(sorry! bad english there)