Okay, here’s a new ‘projected force’ goal for Kangaroo 2.
The deck is not fixed in place at all and has loads at each vertex.
The cables are fixed at their top points and act only in tension - you’ll see the deck moves horizontally but doesn’t move vertically, indicating that the vertical component of the diagonal cable tensions is perfectly balancing the vertical deck load.
From this it should be possible to convert to actual cable lengths and pre-tension considering material like these examples in the thread linked above.
projected_forceK2.gh (10.7 KB)
You’ll need to set the assembly reference location for the KangarooSolver.dll (making sure to reference the right one for the version of Rhino you are running as given here).