i thought that if you could use the same working as the explosives, ya know how you come up to the objective and the little words come up across the screen and say "Press enter to plant Explosives". have that but change the look of the bomb to the pipes and also have a sound effect of pipes being screwed together. the guy who would be carrying if shot would drop them and another guy would have to pick them up.

Ok.. if I understand this correctly you want to make a new gametype, right?

Take a look at the stock sd and ctf .gsc files in the iw_07.iwd file. Try to go over then and understand how they work.

Basics: Yes, it's possible, but it will require alot of work.