One thing you can do is print parts in 2 pieces. Have the layer lines going one way on one part, and perpendicular on the other. This creates a lot more strength in the overall design.
Like for control arms, if you lay them on the bed so the hinge pin holes are going along the Z axis, you will...
Will be fun to watch this build. I have a few parts printed for our Slash. I straightened up the front shock tower and got rid of the caster in the front suspension. I also played around with the body mount angles.