Since I didn't have a any good way of cutting the rings out of single pieces of plywood or MDF at the right thickness (nevermind routing a 45 degree angle on the outside of each), I had to come up with an alternative method.
I decided to build them up in layers of thin MDF and foam core board. This also had the advantage of making them much lighter than plywood or solid MDF would have been.
I solved the 45 degree angled edge problem by making the top layer of each ring the diameter it would have been had I cut the angle in later. I then filled the space with spackling paste, and painted them.
I made the MK1 clover shaped struts by gluing together 3 1/4" wooden dowls and painting them silver.
