I think that the NCR might have a new type of power armour, considering they have industry and science and what not.
Nope, as far as I can remember not a single person can create more power armor.
It's a lot more than just taking scrap metal and bending it to look like the power armor, it has a bunch of fun little knick knacks in it that no one has the materials for.
For example, who creates rubber (not condems) in 2280? Doesn't rubber come from Asia or something?
How could people who don't have the raw materials come up with new one's?
So, a power armor is filled with a bunch of really technical stuff, from the big shoulder plates to small screwes inside the armor.
It isn't as easy to just create something you don't have the blueprint or materials for.
So if anyone could create power armor it would be Enclave Remnants, BOS or Shi, but none of them are close to it.
(Whole post: IIRC)