Well it's 9 months later now and it's been a year and 5 months since i brought this up.
...but tonight while watching a M*A*S*H re-run I figured out who else could play him and have the strongest resemblence. Mike Farrell who played B.J. on the show after he grew that moustache.
Check out LSH's current thread with her pics and sketch of Gordon and then (to anyone who can find a pic to put up here)put a picture of Farrell next to one of them.
I still contend Will Farrell could play the young one and now Mike Farrell (no relation) could truly play the older one. He's about the same age as GL,I believe. I never noticed the similarities until tonight.
If we could only find someone inteested enough in doing a film like this.

Been me. Later
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"A knight of the road,going back to a place where he might get warm."

- Borderstone