I know this will go unanswered as I've asked it before. Why are you redesigning the circuit, you appear to have no idea how the parts even work or what they're for. Why not start with a more basic electronic circuit, flash an LED that sort of thing. It's a somewhat complex design for a beginner, are you going to layout a PCB or point to point hand wire it? If it's not carefully laid out it'll introduce noise into your audio. I know it's for a scout class but they'll all be adults by the time it's a prototype.
PS you don't need a rail splitter since you're using a dual rail supply. So nertz the transistors in the powersupply.