draw robot in 3d

diff --git a/schematic.scad b/schematic.scad
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+// challenge-bot phase-2
+// GNU AGPLv3 (or later at your option)
+// project available at these locations:
+// https://gitorious.org/ozzloy/challenge-bot
+// https://github.com/waynegramlich/challenge-bot
+
+// using
+// https://github.com/josefprusa/Prusa3/blob/master/box_frame/x-carriage.scad
+// as an example of how to code in scad
+
+deck_dimensions = [8, 8, 3/16];
+
+module deck(){
+  cube(deck_dimensions);}
+
+module wheel_mount(){
+  difference(){
+    cube([1.5, 2, 3/16]);
+    // motor shaft and collar hole
+    translate([0.5, 0.938, -1/16]) {
+      cylinder(h = 5/16, r = 0.362/2, $fn = 100);}
+    // nubbin hole
+    translate([0.5 + 0.875 - 0.425, 0.938, -1/16]){
+      cylinder(h = 5/16, r = 0.145/2, $fn = 100);}
+    // mounting screw hole
+    translate([0.5 + 1.213 - 0.425, 0.938 - 0.687/2, -1/16]){
+      cylinder(h = 5/16, r = 0.114/2, $fn = 100);}
+    translate([0.5 + 1.213 - 0.425, 0.938 + 0.687/2, -1/16]){
+      cylinder(h = 5/16, r = 0.114/2, $fn = 100);}}}
+
+module wheel(){
+  cylinder(r = 2.75/2, h = 3/16, $fn = 100);}
+
+color("blue") deck();
+rotate([90, 0, 0]) translate([1.5, -2, 0]) wheel_mount();
+rotate([90, 0, 0]) translate([1.5, -2, -(8+3/16)]) wheel_mount();
+color("red") rotate([90, 0, 0]) translate([2, -(.938), 3/16]) wheel();
+color("red") rotate([90, 0, 0]) translate([2, -(.938), -(8 + 3/8)]) wheel();