I need some advice and possible options. I want to build my own belt sander using a 72" belt. My choice of this size belt is I think it is a good compromise to ensure the belt runs cooler and will last longer. However, it is still in the wish list category as I am not sure what size pullies to use and whether to build using sizes of square tube that fir inside one another or to fabricate it in MDF and Timber. I prefer steel but am open to be convinced of the alternatives. I am a newby and eager to learn. Thanks and cheers