RSRD has the kaibokans I did (early, then both C and D types), variants of the subchasers (different radars, etc visible on the masts). It also has the moving radars and gun directors for the larger ships (watch
Yamato in RSRD if you ever see her, the radar sweeps, and if you surface, the gun director will point at you
). I think I bashed a mats DE as well. It;s been several years, lol.