The problem with carbon is that it will not take even a small amount of strain in the wrong direction without starting to fracture, and will then get steadily worse and will catastrophically fail if in a structural role.
If the strut is subjected to repeated compressive forces it will need to be extremely carefully shaped so that it has no opportunity to distort, and really needs sidewall reinforcement to be safe, and it then gets pointless having carbon !
Additionally, if it _ever_ got knocked or hit with a stone, then any tiny chips will be the start of a stress fracture.
I love the stuff for body panels, but I would never use it for structural stuff unless I had a team going round checking it after every time out
