Hello Rohit,
I didnt find your these classes, but I think there isnt any change in CRM 7.0 to EHP1.
We still use the same MVC architecture and the Genil, BOL Concepts.
Moreover for the classes that you saw in SM30 for the view CRMV_OBJ_BUIL, each having different classes, but to ensure reusability you can see that most of them has same super classes. This can be seen below :
Regards,
Devashish