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You might find it helps to put the wheel on something, you can make a small shelf with some wood & dowels, I put dowels on the shelf too to stop the wheel moving around, find something to put the water on too so it stays put, doesn't spill or get filled with substrate, Drago's tile idea is good or you can make a small shelf to put that on too.
Food everywhere is good! Scatter feeding is better for them than using a bowl anyway as they have to work for it & are very good at finding it so no worries there, other than the wheel & water I would just let your ham arrange things just how he likes it!