Homeworld 2 will be here tomorrow. Can't wait.
And Maverick, use buttloads of cloak generators to conceal an entire fleet that penetrates the sphere. Take your cloaked fleet inside, blow up the target, get the fug out of there.
Alternately, you can do what I did the first time I played this mission. It takes forever, but man it's fun and your fleet will be absolutely huge. Simply draw away a small portion of the sphere at a time with scouts, interceptors, or bombers, and capture the frigates as they chase you around the map. They'll singlemindedly chase your scouts to the far corners of the map, not diverting even as their ranks are whittled down by your salvage corvettes. Rinse and repeat until you've captured all the frigates, or captured a large enough hole in the sphere to take a fleet in without it getting pounced on.