It's typical for jazz music. I say, unless you have an expert ear for chromatic music, anyone was bound to transcribe it "inaccurately" some way or other.
Hey, you were only 15/16-years-old back then. I say, that's pretty talented for someone who was only in high-school.
What's your next arrangement?
Also, If you're re-arranging Pink Woods, I guess I don't have to. haha