I agree with FoxyDee, I think Tanami is the easiest of the timed scenarios. Red Barn wasn't too hard either. Karst Mire was tough until I decided to keep all the staff facilities and staff paths on the ground, while suspending all the guest paths and shops in the air.

Cophaga was by far the hardest for me. It has all these small plateaus you're supposed to build on. After several false starts, I just bulldozed the plateaus flat and built on that.
