Attachment of parabolic trough to the frame

I have 2 ready equipment, the first one is the frame, the second one is parabolic trough. I want that you attach the parabolic trough on the frame, the only dimension of the parabolic trough that can be changeable is the length. To attach it, you need to create a support rib with the same shape than the frame with equation Y=1/96*X^2 to handle the parabolic trough. So the job should be: 1) creation of the Rib support on the frame for handling. 2) change the length of the Parabolic trough to adapt with the frame dimension 3) Attach the parabolic trough on the frame