My thinking was that obviously the entire entry would cost more than a single heavyweight but it costs double a normal heavyweight, each person then only has to pay half of what a normal entry would cost.

Also as each part of the cluster is only 27kg it can't have all the features of a full heavyweight, so one might have a decent heavyweight drivetrain but no weapon (reducing costs), one might have spinning flail things with a decent spinner motor but then only use a set of Saturns for drive (reducing costs), one perhaps could have a small pneumatic system with maybe an upwards facing spoke to get under other robots then attempt to puncture their base but again have a lighter duty drive. And as each robot is smaller they will use less armour and smaller chassis reducing material costs.

Gary: first I need to find 3 other people who also want to do it!