This sound right, keep in mind that this is a prototype, I didn't think at this first, i designed my inner bar with my old bushing without thinking about rotation of them, but the mod is not that complicated i guess, i just need to replace my rubber bushing by steel sleeve witch i could weld it on like JMotensen said if I understand. But my control arm isnt bad as such. I think it would be strong enough and then, I would only have pivot by the heim ends, thats sound logic isn't ?.
Thanks for your advice