Here's an old EZBoard forum that still has some useful information to pick over: http://blueprint1034...t/direction/ASC
Here's one for objects in general: http://www.angelfire...ants/Stuff.html
Some other tutorials: http://blueprint.the...1/view/detailed
Here's another object making tutorial, (good place for downloads): http://7deadlysims.c...al_001/menu.asp
Sorry, many of the listed links to stuff from the forum archives here are outdated; a lot of information lost. What stage are you in making objects? I used to do some creation/hacking of objects, maybe I can help in some way?