how they made it...
The instructions (not fully detailed) are on the french GW site.
But what he did is:
3 gnarloc riders (forgeworld)
1 carnosaur
saurus standard bearer sprue
greenstuff
milliput
ball
wire
he cut up the carnosaur to reposition the tail, and cut off arms/legs.
He cut up the forgeworld models (NOOO!!!) and then attached them as he wanted to what was left of the carnosaur body. Then with greenstuff, filled out the body and extended the neck, etc. and sculpted all the spikes, scales, etc.
The wires are coiled up and the stone work and gyroscope are made from milliput. for the main gyros, milliput around a ball, then when it hardens cut strips out of it..each different size level will interloc with the larger one.
THen a bit of saurus standard tops, with more miliput for the brass work to hold onto the back..etc.
That's it basically.
My EotG pics will be up at CMON prob this weekend

Will post gallery link here...
Sanjay