I had a find at a local flea market:
The MLC-3, an old SW toy from the Empire Strikes Back that was never in the movie, but was WAY cool.
So here is the same toy beside some of the SW CMGs:
Scale doesn't look completely out
In fact it looks like a good fit
I removed all the stickers
So the next step on this little side project is to paint it. I think I'm going to keep the glass dome, that's no less ridiculous than the turret on the AT-TE.
More to come,