Sorry about the break, I've been swamped under a pile of paperwork due to a fairly major redesign I've been pursuing.  To this end, I've now got a new UJ design (which happily is only a simple mod to the one I've already got) and a new frame.  My Blue Peter-esque model isn't the best, but hopefully it gets the idea across.  One cylinder goes straight from the ground to the cockpit, the other from the UJ itself.  This means that they are completely independent which solves the problem of them trying to fight each other whilst in motion.

The new frame design (I'll upload some pics tomorrow) now has the UJ on the ground, with supports spreading out from it to the four corners of the frame under the cockpit.  This frame now has a horizontal extension for the roll cylinder to connect to.  

However, there is a minor issue.  To allow sufficient time for testing and evaluation, I now have six (!!!!) weeks to finish the project.  Finito.  Done.  Could be a challenge :P.  Because of this, I'm planning on using a pair of electronic actuators to provide a degree of movement to show what will be possible with hydraulics.

Now that I'm diving head first into the manufacture process I'll be able to keep you updated regularly as the beast slowly nears completion!

More pictures to follow...