Quote Originally Posted by Coal Dragger View Post
the material is 7075 T6 so it’s going to be considerably stronger than the 6065 of the other two.
This is a little bit of a fallacy.
There are applications where 6061 or 6065 are better than 7075, and I don't think that you're going to see a real material advantage when it comes to a chassis.
6000 series AL will tend to bend and deform when reaching failure rather than crack.
7075 is used in application where breakage at failure is preferable over dimensional variance, such as with uppers and lowers.
The practical differences between 6061/65 and 7075 are less than what the vast majority of users will experience.
I would not consider the use of 6061 in the MPA chassis to be negative in any way.