My take on this:
-Find the most detailed trackmap (something like 1024x768 would be nice).
-Save it on your HD as a BMP file (Width and Height must be multiples of 4).
-Open it in Photoshop or PSP.
-Save it as a 32Bit TGA file.
-Convert the TGA to TEX with Texeditor.
-Copy both the TGA and TEX to the directory where you put all your texs and .gp4 file.
-Open 3DE and load the .gp4 file.
-Add new horizontal object.
-Add a new texture (the trackmap).
-Move it so the s/f line of your track matches the s/f line on the trackmap.
-Start modeling.