[Maxzillian]

As said before, start by taking metal out of your feeder chute. You only need rails along the outside edges to hold the frisbees, keeping a pair of rails 2" wide while taking out sections in the middle will help. Same goes for the piece of plywood on your shooter. There is a lot of material and weight you don't need, especially in that plywood seeing as how it is covered in a sheet of metal for the frisbee to slide against.

Look at hogging out holes in the inner frame rails. You need strength on the other rail (that forms the perimeter of the chassis) to take hits from other robots, but the inner rails that support the inside of the wheels don't take near as much force. You could place many large holes in the vertical span of those channels and sacrifice little strength.

It's hard to tell from the photo, but how thick is your electronics platform?

Hardware is another place. I see a couple frame joints that have 3 bolts per leg. Take out the third bolt on each leg and if it is still stiff enough, cut off the excess length from the joint (where the third bolt would have resided).