Hi, I have the structure below which, under solicitations, is bending a bit towards the direction of the red arrows.
Pipes are 40mm diameter.
I was thinking about moulding two half pipes composed mostly of several layers of unidirectional carbon tape and then glue with mma the half pipe to the existing pipes (along the orange lines).
The layup I am thinking is 10x layers of 50mm wide 650gm2 carbon unidirectional tape, alternated with some 50mm wide plain carbon tape.

What do you think about the idea and the layup schedule?

Also, maybe adding a 2 mm pvc core in between would help? I am just worried that the shear force could cause the two carbon frames to slip on the pvc core, so maybe a not cored layup would be better?

If possible you might consider to add some plates to the sides, at least around the knot section in the middle. They would take the shear forces and would change the stiffness of the structure drastically. no need for welding, a few bolts would be enough.

I contacted the guy who originally made it and he is suggesting this addition (highlighted in red) made out of ss and bolted to the existing structure.
What do you think?