This is quite interesting, Steve. The dimensions display works well
I've got some kind of related feedback. Forever now, Grid Snap hasn't been Grid Snap. Rather, it's just snapping to intervals offset from its original position. I think it'd be more useful if Grid Snap actually snapped elements to the grid positions instead.
What do you think about having orthographic view-specific guides? Similar to photoshop, gimp, inkscape, etc, where you can click and drag guides from the edges of the workspace, and then have a snap-to-guide option as well. Perhaps hold shift while dragging to snap the guides to 1-unit intervals. Combine this with rulers on the left and top to show the units, and it'll provide a ton of precision to the tool set.