These photos are of a Marion Coal Loading Shovel, which Mark is currently building.
The turntable is actually a bearing from a Lazy Susan. These have much less tipping backlash than a compound bearing made from Meccano parts.
Hammerhead Dock Crane
Jones KL 66 crane
Above from left to right:
Bucyrus Erie 150B Doubler electric hybrid rope shovel
Marion 204M SuperFront electric rope shovel
P & H 2650 CX diesel electric hybrid rope shovel with hydraulic clamshell dipper
Dock Crane 2009
Dragline 2006
Hitachi 1200
Jones KL 66 crane 2011