You need three different chassis of the same Mech type fleshed out full on Basic skills before you can move on to Elite skills.
You need three different chassis of the same Mech type fleshed out full on Elite skills before you can move on to Mastery and the Mech/Weapon module slot.
If you have done three different chassis of the same Mech type up to and including Elite skills, in one, two, three or all four of Light, Medium, Heavy and Assault, you can stop at Basic for future chassis of that type and can skip over the three different chassis to the same Mech type fleshed out full on Elite skills before you can move on to Mastery and the Mech/Weapon module slot.
The stats do not update on the Mechs as you get the 2x Basic efficiencies bonus, nor do they update on your Mech chassis in the Mech Lab for things like heat efficiency or Mech speed.
For example, say you have three Enforcers in your Mech hangar. All three Enforcers have unlocked the Elite skills level, which also unlocks future Medium Mechs for the 2x Elite efficiency bonus upon completion of that tier. If you were to purchase three new Hunchbacks, also Medium Mechs, you would only need to take the three Hunchbacks to fully fleshed out Basic skills before choosing one to take all the way to Mastery, skipping the Elite tier for the other two Mechs.
Please chime in if I have messed this info up, but it is correct to the best of my knowledge.
Edited by StaggerCheck, 02 January 2016 - 03:22 PM.

























