Unsolved 4ws covet

Hey all!
I'm trying to make a 4 wheel steering covet.
I copied parts of the jbeam from the pessima.
it doesn't work, as it falls apart when you drive. any suggestions?

 

Did you connect everything to the hatch mounts? If you don't, the suspension is a loose part indeed

 

I would have expected you to have adjusted the suspension code accordingly to add bits in to allow 4ws to happen on the car its what I would do...bit more complicated but it gets results