This is quite interesting, Steve. The dimensions display works well
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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.