How to create cars on simfphys base ?

Hello,
I want to create my own simfphys cars (using models from TDM or LW) and I want to know how to do it because I can’t find any good cars on the simfphys base that includes lights and signals.
Thanks

Copy and edit the code of an existing simfphys vehicles. This might be helpful: http://simfphys.com

And how do I get the lights pos ?