The frame is made of 8020 aluminum extrusions but could just as easily be made of MDF. The handle has a 3/4" by 2" rod on it held in place with a set screw to counterbalance the mechanism. In the photographs this weight is way down near where the rod attaches and could be much smaller (it was sized for a heavier spindle that I was using previously). The lifting mechanism consists of a disk pivoting on a bearing with another bearing riding on the top connected to the linear slide mechanism. The bearings are not absolutely necessary, previously it pivoted on a rod riding in a plastic block with a rod riding on the top. The bearings however further reduce the friction.
The scope is a small centering microscope I use on a small milling machine. A USB webcam work just as well however, I don't have a convenient computer in my work shop area.
Craig