Yeah, I figured it'd be a lot harder than just changing a couple constants.
Also, the speed indicator on the left arc normally follows the arc itself. When I changed the shape, it no longer fits with the new arc. Customizing this would be nice, though I get the sense that it's even more hard-coded than the radar size.
[EDIT] Also, the text on the weapons list refuses to fit the new font size, no matter how big the ANIs are or what I put for the height values in the tbl. The text I'm using is larger, so it's all squished together. Although... I may replace it using scripts or something since I don't like it anyway.