See: How do I install a map or mod?
The map maker made a good challenge for T1 with the scavengers bases, but it's rather unbalanced having both scavenger bases so close to the entrance to base 1. Base 1 is subject to frequent attacks from the scavengers, while base 0 is left alone to research and pick away the scavenger bases.
Very unbalanced. Even without scavengers.