A coople of months back JP Mag in the US had pics of a built yellow FSJ (actually it was a 2 door, we call it a chief, they call it a cherokee) with coils all round and a 5 link long arm front- i believe it used JK diffs and long arms, modded to suit the chassis length. The positioning of the JK axle coil and shock mounts was also then used as the basis to build upper spring perches and shock hoops.
A LOT of work went into it- i believe it was built by an engineer involved in the skunkworks division of Jeep?
Here's one thread on it, do another search on IFSJA
http://www.ifsja.org/forums/vb/showt...88#post1072888
Here's the build thread. Happy reading. Note the engine used......
http://www.ifsja.org/forums/vb/showthread.php?t=89280