Here are some photos of my Cabbing machine.
Overall photo.
It has an expandable drum on the left for my S/C belts, A well worn 100 grit diamond wheel next and a slightly worn 100 grit diamond wheel on the right. Above the machine are the various belts with 60 to 100 grit belts on the right vertical row in various conditions of wear, next row generally 220 grit, next 400 grit and on the far left 600 grit. Because I only have one sanding drum I rotate through whichever belt that I need, the choice depending on what I level of wear and what grit that I need for that sanding step. I do a lot of dry sanding particularly on flat surfaces such as the backs of cabs, geode halves or slabs.
My water system consists of a large plastic container with a valve to control the flow.
Coming from the tank I have a plastic tube that goes to the small ports above the wheels. Rather than having a valve above each wheel I just move the tube to the port above the wheel that I will be working on.
There is a drain port in the bottom of the two trays that runs into a plastic 5 gallon bucket.