[alicen]

My team used to mount the battery to a section of the frame and use smaller pieces of aluminum angle to make sure it couldn't move/slide. A velcro wrap was then used to secure it in the battery holder (think like a cup holder).

For most of the electronics, we would use corrugated plastic (often used for yard signs) because it was light and cheap as well as sturdy enough. Usually we had sections for different parts of the electrical system and the sections could be removed to get to specific areas of the robot. They were all held on with velcro