Building your own is easy, but building a good one isn't. A lot of turners use an old automobile wheel rim from a junkyard with the center filled with concrete for the base. The vertical post is a heavy duty metal pipe about 2 - 2.5 inches in diameter. I suppose that a drive shaft could also be used for that. As already mentioned, the lathe will always be moving -- maybe just a very tiny amount and maybe a lot. That is the part that make this free sanding outboard tool rest not the best option. I have an outboard rest made by Robust on my Robust lathe. It was more expensive than the wheel and pipe option, but if I were to build something like it myself, it would cost nearly as much and not be nearly as nice. It mounts on a swing arm at the end of the lathe and has a considerable range of motion -- more than I could ever possibly need.