speaker system

i was thinking of sculpting a stereo system in the back of a car and i have 2 questions:

1) Should i use styrene or epoxy putty
2) Should i glue the speakers on after the paint has dried or leave them in and just mask them

THANX :p

answers:
1) Both when you need
2)glue speakers after painting

not to ask two questions in one thread but is sculpting putty the same as epoxy putty

basicly, yes it's the same