Side note, just out of HS I worked for a year at a Pier One furniture store. My manager found I had a knack for assembling things, so I spent a lot of time assembling the shelving they used, which she called "Lundia" shelves. The word stuck with me and I found the name was the manufacturer of the shelving.
The shelving was very configurable, and I know for a fact they can hold a lot of weight. I thought it might work well in her studio for supplies and drying racks. I was a bit sticker shocked at the price of some of it though.
Doing some googling, it looks like a lot of potters are using the IKEA Ivar shelving, which is very similar. There are pins about every inch or so for raising/lowering shelves, there are also additional bins, shelves, doors, and other accessories to purchase to make them more configurable. They are unfinished pine, so making custom accessories shouldn't be a problem.
Shop our IVAR storage system and customize your space. The system is designed so you can combine different pieces to suit your space.
www.ikea.com
I probably could mill out some these, but got enough projects for my near future, so these may be what we go with to start with, at least some basic shelves.