Yeah, this would make a bit more sense then someone basically throwing a football at a big-ass battleship when it's critically damaged and then it blows to hell. I also think that little pew-pew plink-plink guns like the MG shouldn't be able to take large ships down... Imagine shooting at an actual ship with a pistol after it's been battered. It wouldn't suddenly go up, unless you hit something that would explode, but it might not even explode then. Unless the ammunition used was incendiary, but that doesn't help very much.
As was said before, I think that if you hit a large ship in one of the turrets with a "High Explosive" designation while it's in it's death "throws", the turret will explode and then you can't salvage that weapon. You'd probably only get scrap metal.
Speaking of scrap metal, I think you should get some from ships that have been damaged beyond repair, and also from a ship's debris when it is actually destroyed. Then you can sell it or smelt it at a station or whatever, and get some metal with a chance of rare metal.
You could also have ships dedicated to stripping scrap off of ships, it might make for a kinda cool scavenging mechanic. Also, if you decide to board ships who aren't completely boned, you could strip machinery and electronics. But if you board, there's a chance you could get ambushed and your crew could get killed.
Also, the idea of escape pods shooting off the ship would be cool if you could capture people after a battle if you win it.