Thor, or should that be Zeus?

[Chaz]

Yes, I can grasp the mass effect but surely there is a slope of diminishing gains here - it may work perfectly with a mass of say 1000kg but work no better with a mass of say 5000kg??

The sweet spot is getting the balance right;)

Agreed. The 'aim' here was for a machine of total weight of somewhere between 1 and 2 ton. I can move 1 ton with engine hoist but once assembled, its going to be more tricky so looking at options for wheels or some form of lift / move system.