I've gotten all the sod removed from the ground. Ive raked the dirt and its mostly level. However it does slope to one side some. I plan on using paver stones under each leg. I have about 2-3 inches of sand spread evenly and tamped to even out with the stones. As long as the stones are level(not on sand, they are packed in the dirt) do i need to worry about the actually ground below the sand too much as long as the pavers are level from stone to stone. I plan on putting insulations/foam on top of the sand and a tarp on top of all that. Let me know what you think. I appreciate any help!