Co se staví
Implement the full range of Lego track items as a library in TRAX3D involves finding out the geometry and translating that to track definitions. It is mainly handwork and a lot of trying as most manufacturers are not very specific in the information they publish.
In most cases it needs measuring the actual items and laying down some test layouts.
Apart from time I would also be helped with information that is available. Please send me useful links if you have them.
(photo by Bill Ward / https://www.flickr.com/photos/billward/32521653932/in/photostream)