The raider and especially battlecruisers look kinda rushed and just thrown into the game.
The Raider was a 3rd party graphic (made by "Nathan" if I recall) that somehow impressed Stardock and ended up in the game (as far as I can speculate, I didn't get a proper internet connection into SF until 2005, so I don't know the true story).
The Battle Cruisers, well those are absolute shit so I have no idea why they were included in the first place, the Arcean design is the most original out of the 3, the Drengin one is a bastardization of their Freighter, while the Terran one is the most forgettable.
As for your reconstruction, I usually would like to see a "near-perfect" rebuild, so why don't you save two files, one being that you got now, and the other file looking more like the original Raider?