you'll be surprised how difficult it will be to build the robot around the pneumatics and keep with the weight limit! As Mario mentioned, going for off the shelf parts will make your build even larger and heavier. The least weight I could compress an LP system into was about 2.5kg with custom ram and valves...with off the shelf parts that was x3 heavierBut with a light chassis (HDPE) and a simple drive train you should be able to do it.
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