Looking good Gnappo
Notice Missing Shape Hangerv error.
If you select the air field AFSml-1 from the group you will get a error message.
Missing Shape Hangerv
To correct this just open the AFSml-1.obg file using note pad and delete the first line
F03VOD0, HANGERV, 0.000, 0.000, 0.000, 0.0000, 0.0000, 2.5169, 3328, 2, 0, -1.00, -1.0, -1, 0, 0, 0
save changes.
Now when you select this air field you will no longer get that error.
To do it now that you have your fields place, just open YOURTERRAINNAME.oba file.
Find all the fields that you were using this file and delete the line.
Pokie