Hi Henry - I've just read the thesis linked prior. Excellent case study and summary of how a machine should be designed. The machine in the study uses viscous damping via layered tubes to dampen vibration. I mentioned that you could use laminated metal to build your machine. If you place a thin rubber sheet between your layers you have an excellent damp structure. Perhaps the start of a new technology for machine building and your just the person to get it off the ground. If you are not breaking down the structure for transport then epoxying them together or contact cement is the way to go. I was going to look at this for Maximus. 2mm zinc anneal is the cheapest material to cut via laser. So a ZnA laminate is the process I've been looking at. Peter