cant be that hard to make,specially with a jig,id use square tubing for the build as its a bit more stronger,i had a ford ranger and bought round drop i-beam witch have bent with the weight of the truck.  its to find the right bushings and ball joint to match and to line it up that would be more difficult, anything is possible with a welder and a smart head lol

I'm running the Calmini control arms with Sidekick lower ball joints.. They really do make changing out the ball joints an easy job. In my chats with Calmini, they also said they wont sell the arms separate from the kit.