I've uploaded the track if one of you want's to see if it will work for you.
http://www.mediafire.com/?sgeo0t8uihpcutn
There are some issues you must fix in order to run on your track.
1 - Your track has not a TDF file. Copy some TDF from another ISI track to your track folder and rename it to
Greenspace.TDF
2 - Open the TDF which you copied and renamed, first section of the file is just coments (lines with "//" at start don't count"), scroll down untill see "//Roads", at the bottom line of this section change the line to:
Materials=road_01
3 - Your road material has a no valid texture. Replace the difuse material called "track01.ifl" by "track01.dds". You have this texture in your maps folder, so it's not a big deal. Save your GMT again with this correct material.
4 - Your GDB file is not pointing the TDF file. Check this line out:
TerrainDataFile =
Replace by "
TerrainDataFile = Greenspace.tdf" instead.
5 - In your SCN file, add a line to search files in the root of your track:
SearchPath=GAMEDATA\LOCATIONS\GREENSPACE-RACEWAY\ (it's important because TDF file is in root directory).
6 - Delete the MAS file and 000 file present in your root directory. You don't need to concerning about pack files at this stage and the GMTs and MAPs are still unpacked in your folders. You might leave this point for the last stage of track building because if you have a GMT packed in a MAS file, the game engine will load it before than the unpacked (and corrected) GMT of your folder "GMT". Pay attention on that.
That's it, I did these modifications and eventualluy I was able to race normally in your track.
Edit -> Probably you'll want to break your road.gmt in smaller pieces afterwards and, mostly, get the grass portions apart of the tarmac for several reasons.
Good luck