My job and schedule have gotten in the way of finishing this project before the end of April.  Funny thing is after the first week in May I'll have lots of spare time.  It will get finished, but I don't want to rush the experience just for the contest.

I'm hoping to find a piece of light gray slate tile of the correct size and draw the cave painting of the man pointing at the stars.  The painting will be done in charcoal pencil.  Then somehow I need to drill holes through and put LEDs in as the stars.  For each correct note played on the recorder (I had no space pipe laying around) another LED would light.

I also need to bight the bullet and order some parts.  I got hung up on exactly which op amp would be ideal, rather than which one would work.  I need a dual op amp for the two stage active filter, and I'm thinking of the humble 741 for the stability of the V/2 signal.

Thanks to everyone for their support so far.