DoD:S - Bombing Objectives

I’ve looked all over, and have not found a Day of Defeat Source tutorial on how to make objectives that a team has to bomb… Currently what I’m trying to make is a bomb area where a flag’s in the middle showing which team owns it, and two Flak 88 Turrets connected to that one flag, how would I make it so that each turret needs to be destroyed in order to make the flag Allied? And how would I make the Flak 88’s turn from a single prop to several broken pieces of the Flak, haven’t found a tut for that either… Thanks for the help, really appreciate it!

Here’s a small picture of what it will look like.