I read part of "Entities" page in the manual already... However, I guess I have to read it all....
For the model.. I am not talking about a specific one so not all of them were created specifically for 3dgs ... I have some free models websites... But one of the models I am talking about which was created by a 3dgs user is the building that rvL_eXile created few days ago...
http://www.opserver.de/ubb7/ubbthreads.php?ubb=showflat&Number=337356&page=3