you have 20 days to test the software, so if you make the 3D object before (with blender for example) I think 20 says is enough to insert those sing in more than one circuit.
create your object inside blender and export it as 3ds, import that 3ds into 3Dsimed2 and export it as .GMT
add one more definition inside your "name of the track.scn" example:
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open the "name of the track.scn" with 3Dsimed 2 and locate the sing where you want using traslate object options.
there are tutorials for every software... google it