This is not a simple kit, and it is furtherly complicated by a lack of instructions. Hopefully this workbench feature will help anyone else putting one of these wonderful and well detailed models together.
According to a commenter, “There are instructions available now. Just give Forgeworld a call and they will send it to you.”
When the Forge World models are cast, the mould is given a spray (I guess) of some kind of lubricant to allow the cast model to be released from the mould easily. However the lubricant also acts as a barrier to paint, so as happened with previous models I (and others) have painted is that the paint flecks off.
Washing the pieces of the kit in water with a drop of washing up liquid should remove the lubricant. Avoid using hot water as this could warp the resin (a useful tip if you need to bend warped resin back to its original shape).
The first stage was fixing the suspension to the main body of the vehicle.
The left side was added the main flatbed of the superstructure.
The driving axle was fixed to the driving shaft, this was then attached to the suspension.
Hopefully my workbench feature will help anyone else putting one of these kits together.