So, I was thinking, which, as you all know is almost as dangerous as letting chanman think.
As of 3145, Niops has an 85% strength BattleMech regiment, and 'Mechs are considered to be secondary to infantry and vehicles. Presumably, it's like the pre-Jihad days, where Niops fields three to four infantry regiments, most likely with the 'Mechs split between regiments. No exact mention of infantry, vehicle or fighter strength had been made.
So, by 3145, Niops is slowly getting their crap back together. Eventually, they'll either rebuild a Workshop or two, or perhaps a whole factory. It may be some time before you can produce any variety or designs at that point.
So, your goal: choose one to three designs to fill out the NAM. They could be 'Mechs, fighters, battlearmor or vehicles, or even small craft. While Niops may not have lost technical expertise, lower tech will be easier to get production running on.
What would you build?