ive been making a obj map for about 2 days now and ive come into a few problems, then i have to make my flak88 into a script_object it always comes up with some stupid error saying failed to create entity. how can i fix it?
also i want to make a breakable wall (by bashing or shooting etc) im guessing its mainly done like a window but i need to know how to make many brushes form into one e.g. my broken wall will be made of many brushes forming the pointy broken bits
please try you best to help

and when im done with the map can someone tell me what they think?
EDIT:
found some more questions

where can i find the model of the v2 rocket and how do i add sound to my game ( a nice bunker or big facility sound would be good)