That's certainly not how I pictured it, haha. Vertical text sounds horrible. You know how a toolbar has groups, and those groups are contained in little boxes? In the thumbnail above it's Belts, Production, Chests. Every time you make a new group, it appears below the last one. My idea is that you click a toggle for that toolbar, and now new groups appear to the right. You add a new group, it sticks on the end of the line on the right.