Thanks, was my thinking, but needed somebody to agree to my thinking.
Clearly the height is directly proportional to the lenth of the arms.
Hight with arms at 60 deg = height required / Sin 60
= 800 / Sin 60 = 923mm
So with a couple of pulleys...
When I showed option 2, it is not bolted to the floor. It is just connected to a common frame. The idea is to rather build 2 smaller lifts (table size 1000 x 400). Then one can even use it as a bike lift while the car is on jack stands