Well, I was thinking about slicing the second half of the map off (basically after the eponymous gorge) and altering that initial loading yard area, but you're right: it may be better to just make a new map.
As the title says. I think it'd make an interesting MvM map, though the waves would have to be different than your standard to account for the increased size of 5gorge in comparison to the existing MvM maps.
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