Having a Vehicle/Aerospace style BattleMechManual would help new and even old get better into the game.
I'd like to point out, that CGL has been trying make easier / quicker games of Battletech such as Alpha Strike/BattleForce/etc. Allow for the original game's other components to be more readable would be good thing. Some cases, TotalWarfare is not easy to follow for newer players with tsunamis of rules and redirects to other pages isn't super keen. Having middle ground sort of book with other units in it would be appealing, if it's done same style as BattleMech Manuel.