I am also pretty new to this, as you are, but I would recommend delving into the build diaries section in this forum, as there are nearly unlimited ways to create the body for your robot. Arguably this is the most fun building, working out what the not will look like! There are people using plastics as you mentioned for beetleweights, but also various metals, wood, chopping boards, baking trays, biscuit tins and more. Really opened my eyes to what can be done fairly easy.
Have fun and good luck




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