Four in a Line

Asle known as Connect Four, Four in a line is a game where you try to use your pieces to get a row of four. The rules can be found at http://en.wikipedia.org/wiki/Connect_Four. My thing also has two tubes on each side of the board for easy storage of pieces. I made this thing in OpenSCAD with the following code:

Board:

difference() {
cylinder(8,55,55);
translate([0,0,1])cylinder(7,53,53);
}
//cylinder(8,40,40); //Comment out this line before pressing F6
difference(){
transla