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In the Division C rules it says “The structure must be designed to hold the bottom of the loading block no more than 1cm above the plane… “

Does this mean that our structure can ONLY support the bottom of the block?
Or does it mean that we can hold the block any way we want, but the bottom must fit the within the 1cm parameter.

I interpret this as the latter (eg if I told you to hold the bottom of me 1 ft above the ground, you don’t just have to hold the bottom of my leg, you could support me any way you want as long as I’m a foot above the ground)

Not sure about whether your interpretation is correct, but why would you want to hold another side instead of the bottom? Wouldn't that be very inefficient?

Rule 5 II c.

The opposing force must always be on the bottom of the loading block.