Obstacle Course animation planning

I'm trying to do a Obstacle Course animation like animation students are doing. cause it's brilliant exercise to understand more timing & more spacing.

1.very first the planning process.

2.after that i modeled the set by my self.

3.then the animation

Obstacle course planning

Obstacle Course modeling

Modeling the Set is the easiest part with the NURBS. Just added a GI Light for look nice.

When the animated shot comes, i planed to render with Maya Software Render, Because Mental-Ray doesn't support image planes. several times i try to render the image in the bottom with a image plane but it's didn't work.

Hand Drawn Obstacle Course BG 

This is the Background that i liked to put in my Obstacle Course Animation.I draw this Image with Photoshop. This is the first drawing that i draw with the Photoshop.