I don't know how long the full part will take, but the first is done.
I am cataloging all mechs and variants available in 3052 (technically 3055, for my Tabletop collections sake, but 3052 for here)
I've completed for the Mechs that are already in MWO - the below chart is all the additional Variants we could have in game, right now.

The Commando I find interesting, as it has a Ballistic slot. Same for the Cicada, as it has 8 Jump Jets.
The Firestarter FS9-S1 and Stalker STK-3Fb with their ECM could cause huge balance issues.
The Zeus ZEU-6Y has a Binary Laser Cannon, which could be implemented with 2 Large Lasers, or by adding the Blazer to the game (2LL weight, heat, stats, etc 1.5LL damage).
Everything else is just more variety.
This is the chart for all Mechs in game.
Bolded are the variants not-in-game.