OpenRC 4WD Truggy Chassis and Sides to fit smaller print beds

UPDATES
2013/09/30
After printing out the rest of the parts, I discovered a small error in the design of the front plate. I have fixed and replaced the STL.

2013/08/22
My print bed is maxed out at 150mm x 150mm so I redesigned the large parts starting with the chassis plates.

The chassis is now in 3 parts that interlock together.

The side guards are in 2 pieces that slide together.

For extra support of all the pieces, I created a slot in the side guards for the chassis to fit in.

All the parts should be printed without support material. I created breakaway(cut away) supports directly in the model.

If there are any suggestions as to further improvements, please comment and I will see what I can do.