Note that Tossha hasn't validated these models yet so there can be errors in it. I do know of two errors which I can't fix though; the dirthills having wrong heights and the big scenery arches being placed in the wrong location.
The blocks that still don't have 3d models yet:
StadiumWater, StadiumPool and StadiumDirtBorder
Download: http://www.vinummusik.de/Trackmania/TrackStudio%20unofficial%20version%20(new%20models).zip




Tip: Use the "Hide undisplayed" filter to reduce the lag
I do hope Tossha will soon come online again. Not only will he finalize these models but there is a whole new TrackStudio version with lots of cool features waiting to be released. For so long...I hope this version will do okay for you too










 and to think it can get better the it allready is
 and to think it can get better the it allready is 




