I can see the flaws in having a full 100% weight allowance for shufflers - you could probably attach a couple of legs to some wheels and then give yourself a shell spinner heavier than most robots are, whilst I do agree it encourages diversity in order to get that reward of extra weight, I think it'd be silly to give shufflers the same weight allowance as true walkers (the latter being as far as I'm aware significantly tougher to implement...) - As Ellis says, about 1/3rd would allow a featherweight shuffler to be about 18kg, and about 130kg for heavies which is enough to get some benefit through bigger weapons or whatever, but not so much that it's balance-breaking. Would still be cool as a demonstration though, even if it wasn't tournament legal, under the current rules... of course, you'd have to check with EOs first but still.