Spent the morning creating separate shadow and ambient occlasion layers for each object within the hanger scene in PhotoShop and then re-importing the lot back into Shake.
This allowed me to 'put' Steve behind the foreground rigging and in front of the servers.
I have also started to get the hang of the Shadow node in Shake at last - may go back and rework the previous ones!
Put in Steve and Graeme chatting and pointing nearer the foreground.
More to add - walking on the gantry; walking from behind the cargo containers to name a few - getting there though !