Very nice!
Regarding the rear dropout spacing, the reason you want the dropouts to be perfectly parallel is so the axle is straight; skewed dropouts can bend the axle, leading to uneven wear on the cones and sometimes to a broken axle. But to be honest I have not checked this on any bike I've owned. Another thing to consider is wheel dish. When you place your wheel in the dropouts, look to see where the rim ends up between the seat stays. If it's not perfectly centered, you may be able to center it by adding a washer or two to one side of the axles.