While it doesn’t have “parts salvaged from fights”, would recommend checking out Avorion.

• Fun ship creator ( can make as simple or as complex ship design as you want, for some extreme examples check out Steam Workshop )
• Manage fleet of custom made ships
• Ship design affects handling, combat performance
• Send ships to missions
• Fight along side your ships, control other ships with RTS-like control options
• Has optional multiplayer

True MMORTS with persistent non-instanced map and PVE content.

IMO best example was Ballerium developed by Majorem ( but game doesn’t exist anymore ) - on graphical level looked like WC3, on PVE side there were monster encounters and monster pack migrations that you could engage or had to run from