After agreeing on a final design, we started making the pieces on SolidWorks. Here are some pictures of some important parts:
This is the front and back piece of the walking module. It has two "legs" that will help the robot balance. The height of this piece determines the height of the robot. We decided to connect the side pieces on to the front piece with heat staking. This process consists of melting the plastic. In order for it to work, we had to make this square holes where the side pieces would connect on to the end pieces. As you can see in the picture of the side piece below, there are small bits of plastic sticking out.They are intended to fit into and stick out of the holes in the front piece. Then, when using the heat staking machine, we would melt the extra plastic sticking out of the holes so that it would secure the two pieces together.
The piece below is the bottom. We forgot to add this piece in our original design and then we realized that we had to include the motor in our design, because without it, it would simply fall out. We also made sure that the motion module would be big enough (but in width and length) for the motor to fit in. A The bottom piece is designed to fit tightly through the "legs" protruding from the front piece. This would allow us to connect the pieces easily without worrying about heat staking or other methods of attaching two pieces of plastic.
This pieces below are what we replaced the gears in our previous design with. We made the circle in the middle a tight fit, so that the circle would rotate with the rod. We made the circle on the outside a loose fit so that the bar could rotate freely. The bar connects two of these circle pieces. The bar has corresponding holes where a small rod would connect it with the circles.
This circle piece is slightly different from the other one, in that the circle in the middle is smaller. The motor that we are using has a rotating metal rod that would power the whole robot. Since this is what we are attaching our circles to, we had to adjust the size of the middle hole so that it would tightly fit with the metal rod.
This is the front and back piece of the walking module. It has two "legs" that will help the robot balance. The height of this piece determines the height of the robot. We decided to connect the side pieces on to the front piece with heat staking. This process consists of melting the plastic. In order for it to work, we had to make this square holes where the side pieces would connect on to the end pieces. As you can see in the picture of the side piece below, there are small bits of plastic sticking out.They are intended to fit into and stick out of the holes in the front piece. Then, when using the heat staking machine, we would melt the extra plastic sticking out of the holes so that it would secure the two pieces together.
The piece below is the bottom. We forgot to add this piece in our original design and then we realized that we had to include the motor in our design, because without it, it would simply fall out. We also made sure that the motion module would be big enough (but in width and length) for the motor to fit in. A The bottom piece is designed to fit tightly through the "legs" protruding from the front piece. This would allow us to connect the pieces easily without worrying about heat staking or other methods of attaching two pieces of plastic. 
This pieces below are what we replaced the gears in our previous design with. We made the circle in the middle a tight fit, so that the circle would rotate with the rod. We made the circle on the outside a loose fit so that the bar could rotate freely. The bar connects two of these circle pieces. The bar has corresponding holes where a small rod would connect it with the circles.
This circle piece is slightly different from the other one, in that the circle in the middle is smaller. The motor that we are using has a rotating metal rod that would power the whole robot. Since this is what we are attaching our circles to, we had to adjust the size of the middle hole so that it would tightly fit with the metal rod.
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