Dome construction

I'm at the point where the software is almost done, and the hardware is just about done as well.  So, in order to do fine tuning, I really need to build the body next.  My daughter was sick today, so I decided to start with the dome (because I required much less workspace for this). 

I'd been concerned until yesterday about how I was going handle this.  But yesterday I had a brainstorm... styrofoam craft balls!  I bought a 5" ball and tried wrapping it with aluminum foil.  This was giving mixed results because of the bumpiness of the ball.  So I decided to make a hemisphere out of posterboard to act as a layer between foil and ball which allowed for much smoother results.

I took another piece of foil and mixed some blue-purple paint to paint the wedges of the dome.  Now I just need to build the main body to decide whether to use the hollow shell by itself or if I can get away with leaving the foam ball in...