@ Simon Chaddock: I built this myself, and by just removing the brace in the middle, the u-joints are not a problem.
Anyone else who needs instructions for this: you're obviously not a TECHNIC builder. The 4 pics were more than enough for me to build it.
A neat robust steering suspension layout but how many trucks have double wishbone suspension?
Just one point but from the photos it looks as if the steering pivot axis and the centre of outboard universal joint are not quite in line. If this is so then it will put a bending force on the universal joint when steering under load - and we all know they are not that strong.
All you need to do now is build 3 more units and mount them on a chassis!
Keep up the good work