I sampled the weapon sounds from the Starwars and Startrek movies. I edited the sound clips myself. The big explosion is a combination of samples from the movies Super 8 and Tron: Legacy.
I also made the skybox background from various images I downloaded, edited them further. In combining with FS2 made backgounds, I got the look I want.
EDIT: The weapon effects I made them as well. I created ANI files for those.
This mission is an Act ender. There are ten Acts and each of them have a "BOE" mission. Further more, these BOE enders escalates. Meaning, the next ender is more chaotic. Actually, most of the missions (80%) are in the BOE category.
Now, I don't just throw the set pieces around liberally. The mission design covers most possible scenarios through player actions. These missions are not restrictive by tight scripting. Events will happen depending on the player's decision from load out to which target to attack first. Of course, there is a main objective. Too much strict coding will kill the mission's replayability. Although, my mission coding, are also complex because of branching scenarios from dialogues to major events.