I gave an estimation of 20Kg before, but that was a number I pulled out of thin air (sorta). Sensors are quite negligible in size and weight compared to other subsystems. The heaviest stuff would probably be the batteries, motors, wheels, laptop as well as additional actuators such as grippers.
At the beginning, the max footprint that I proposed was the size of a standard magazine. Perhaps we should extend that to around A3 size (just the body).. it looks enough for our purposes.
We could certainly find out these weights in our research stuff, if one takes the time to do it though
