HO steam loco usra 0-6-0 with smoke & sloped tender.

I want to add sound and keep alive to it.  There is no way to tell how to take the engine apart except to break it at the front.  I took out the two very tiny screws on each side, which broke right off at the cast frame without much pressure!!  I unscrewed the back of the frame with no problem and it was lose from the plastic.

I really need to know how to take the engine apart without breaking it.