I cant really help to much but i will explain acouple of things take in mind i am not looking at the files nzqn ,,in the queenstown scenery folder you will see scenery and a texture folder ,,,the bgl files in the scenery folder are placement files or the model bgls but they are normally easy to work out by the size of them ,1kb or close to that would be a placement file and 15kb up would normally be a mdl bgl file which is the model file exported out of gmax in fsim data ,so if you are looking to take a object out you would look here and go for placement files ,say with luck there would be a trees bgl than i would take that one out seeing they dont show up because of a alpha texture problems between the 2 sims ...
so i would go and take anything that doesnt work out including a afcad file and rebuild the area with fsx default trees and object and remake the afcad new from the default one ..
pretty much i would if it was me add one file at a time to the scenery folder and wait till something goes wrong then fix it then add another till i have a airport that works ..
qn also has photo textures so there will be placement files in tha scenery folder they should work so i wouldnt touch them ..
good luck
always make a back up of the folders you are working on
