Hmm, apparently when I made V1 (paper) it was scaled at 96% due to A4/US-Letter discrepencies. I'm gonna print this one at 105% to give a little more room for electronics.
Made a new blank to use as a mold.
Ended up going with 110% scaling factor which was probably a bit too much. The eye hole spacing is a bit weird. Still, probably the kind of thing that nobody but me will notice.