I just downloaded the Mercer Airfield which is located south of Auckland in New Zealand. I am intimately familiar with this Airfield as I used to fly RC planes there.
The creator has done a good job of building placement etc. It looks like he has used default buildings from the sim. This means the detail is saddly lacking. I like the way he built the bridge over the stream which Allows access to the original hanger complex. This is the most important element of Mercer.
If the creator would like to make the Airfield more accurate I would be happy to supply photos of the buildings.
Anyway it is good to have it as is. It is a good place to fly a Harvard from. I have seen them there. They often practiced in the airspace over Mercer.