>>How do I make a 'ghost track' ie no scenary just the flat track in place, pitboxes as well
If you're trying to make a track that looks like my Dijon (you can DL the video in the 1979 mod thread), it's fairly easy.
First, create the entire dat (including verges, banks, elevation, banking, pitlane, kerbs and flags).
Then export Dat to 3DS.
Open the 3DS in ZModeler.
Export the track tarmac (DTrack).
Then, in 3DEditor:
Import the GP4 tarmac in a new scene and delete all other scenes.
Ingame, your track will look more or less like my Dijon track.
>>How do you make banking?
Double-click on a track sector, then select "track banking". Then enter a number in "banking amount".
If you follow Maverick's tutorial to the letter, you should be able to create a ghost track within a day.