Hi,
I don't want to keep you from trying or to keep others from helping you, but I think if you are up to creating office standard markers, you should consider getting professional paid help. If you get free help now, you may get in trouble when you want to have an update made or even bugfixing... Or worse, if you 'hack' your own object, you may make the work with them ineffective for a whole office for years...
Some guys make a living of it in this topic. I'm sure they'll be glad to help you some way.
My worries may not apply to your situation, of course.
Regards,
Zsolt
Zsolt Táskai
ArchiCAD Development - GDL Team
AC13, AC14 and upwards...