There is no size restrictions, it just has to it through the door! Speaking as a 16 year old design technology enthusiast I imagine you could build a heavyweight with a lot of planning and reading through all the information on this forum, it's the best place for research. I would build something cheap and easy to begin with to save expensive mistakes, something wheelchair powered and sla batteries. Something without an active weapon.
Your probably best to start off with a feather weight though, it's cheaper and easier but you will learn a lot.
Just my thoughts.
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