Something like you posted does look better than most I've seen. You could try cutting some paper, aluminum beer can, or vinyl decal material and stick it on for brainstorming. Simple shapes like the triangles and rectangles would be easier for the first time inletter to layout and execute.
get a chuck of walnut and use it for a dummy practice. a 4x4x1 inch would give you lots of practice. Be sure you cut small slices and have sharp tools. Be slow and steady and you will be ready pretty soon to do it for real.
@Austin....I think the Marbles Bullseye is a big improvement over the factory irons. However, I don't think it is as good as a receiver mounted peep. If my eyes were 20 years younger the Bullseye would be great, but once I get much past 50yds my eyes have trouble focusing. Your eyes are still trying to focus on two planes because the barrel mounted Marbles is 8 to 10 inches in front of your eye, but it looks very cool.