The monitor stand was built, like many project should be, with materials I had lying about. The wood I used was pine bed slats from an old bed. They are roughly 15 mm thick and 60 mm wide with varying lengths roughly 6 metres in total.This is probably the minimum dimensions you can use without compromising strength and sag.
I used 14 M8 x 80mm coach bolts, roughly 40 M8 washers, 14 wing nuts and several M8 nuts. This would cost roughly £6.00 in your local hardware store.
The orange elastic straps
came from a pull up bar I bought but I am sure you can find an equivalent material to act as a spring such as a bungee cord. The idea came from my work lamp. It has 4 lengths of metal on 4 pivots to make a parallelogram, there is a spring diagonally across the frame. As the light is pulled over into position the downward force is increased, this is compensated by the spring resisting the deformation of the parallelogram. I have incorporated this feature into my design.
The main components are put together with the M8 coach bolts but the base and hanger are screwed together using 30 mm countersunk wood screws.
I used various tools throughout the build and I will highlight what I used and how I used it on each step.