search and destroy game mode GREAT idea possibly.

okay so i really need to get some ideas jogging for this game mode all of you call of duty players know what search and destroy is.

if not i found this set off rules that the game uses

For Search and Destroy, the objective on the attacking side is to plant the bomb on one of the two cargo holds (A and B on the mini map).
-Only one person can have the bomb and if they're killed, it will lie on the ground. All you have to do is walk over it to pick it up, but it is visible by the other team so watch out for campers.
-When you have the bomb, plant it(watch, people are defending the bomb and there are usually bouncing betties)
-You must defend the bomb for about 40 seconds(not sure, but around there) and make sure the other team does not diffuse it.
-After the time is up and no one diffused it, the bomb will blow up so stay clear or you'll die from it. Then your team wins.
Defending:
-The other team is going to try and plant the bomb at one of the cargo objectives. Make sure to defend at least one. Try and defend the one where the least amount of people on your team is. Set up your defenses and just wait.
-If the bomb is planted, try to eliminate as many of the other team as possible, but concentrate on diffusing the bomb. You can not shoot while diffusing so make sure there are no enemies around you or bouncing betties set up. It takes about 5-6 seconds to diffuse so watch the time so you don't get blown up.
You play best out of 6.

okay back to what i wanna do. i want to try and make a game mode (not for speedball more like scenario or woodsball

but the problems that exist are as listed

1.planting the bomb.
how would the other team know when the bomb has been planted?
how long would it take to plant the bomb/how long before the mock
explosion.

2. spawn points
were would the d-fence spawn
also the off-fence

3.time limit
how long should the rounds last cuz there is more then one round (maybe)

4. the bomb!
so what would the attackers use and if shot they would have to drop it so the other team could see it!

all of this is something i bet alot of people would love to play and it could become populer who knows!

but i need some help so any ideas or solutions to those 3 problems would be greatly appriciated!