[Richsgt]

Also you can change out hardware that isn't truly load bearing from steel to aluminum and even nylon nuts and bolts instead of the standard steel.
Electrically, shorten the runs up and even electrical systems to keep the high voltage cables as short as possible, eg victors right next to the distribution block, right next to the battery and motor.
Lastly replace any tubing with thinner walled tubing and lexan with thinner lexan, 1/16 to 1/32