Great job Steve. I have a small mill but never even thought of making a complete riser myself. It just takes so much time like you say. Measuring, marking, clamping, milling and all over again for the next side.
As your scope (nice one!) and mounts are black I'd go for a blue riser.
Can I ask where you got the dovetail cutter from? I have one but it has a rather thin shaft and I'd like a more substantial one like yours.