"How about Fighters of 25,000 tons?"
Considering they can run around a star system for *months* without needing to resupply at all, I'd say that's not excessively high. Mines are off, Sats might as well be space stations at that size.
Components aren't so bad; a 10kt bridge is a bit odd, but since no other control systems are needed I just lump those in there too. The DUCs are 30kt; large? Consider the fact that they never run out of ammo..
Having a 20kt storage bay store 100kt+ of stuff is a bit odd though
Phoenix-D