Plan A: Mr Mike and a piece of heavy machinery and a laser level.
Plan B: Rototiller, shovels, and level
Plan C: Shovel and level and a piece of wood.
Mr Mike has been sick, and is now overwhelmed at work.
The rototiller will not start.
Just me, and my shovel! I figured out how to make the first part level. I have to dig out the upper section, and add to the lower section to get the seats and the center to be level.