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Great idea, you could use colored golf tees for the pegs!
To mark the original seed, maybe you could put a black O-ring around the selected balls.
Great looking project. Actually, I just wanted to comment on your login name. I used to have a personalized license plate "ZAPHOD B", just to remind me that in any adverse situation in which I wasn't wearing my peril sensitive glasses, at least I could slap both forehead and my right knee while exclaiming, "Zark! And I thought I was one of those guys who really knew where my towel was!"
It seems like there would be some distortion or reduced amplification because the layers of wood don't have a smooth 1/e**x curvature. Did you think about smoothing out the horn, instead of having the "stairsteps"? Or is that too much detail for not enough benefit?