The altarpiece is mostly styrene, I added a few extra bits later.
The operator is made from a few sources- I think the torso is a Mordheim Mercenary, I beleieve heads and arms are from the Flaggellants kit. I magnetized the platform and altarpiece so it could be removed.
Bosch, Garden of Earthly Delights, right panel:
Brueghel, Fall of the Rebel Angels:
Some more views: