Finally, we have reached the most difficult part. To turn the parking lot into a field. The parking lot was made of stone slabs and concrete. A neighbor told us that they thought it was made by a contractor. Motohiro and I made this about ten years ago. 
We were able to borrow a concrete crusher, and we went through it all yesterday. Each stone slab weighs nearly 20 kilograms, and there are about 30 of them.This work would not have been possible without Motohiro's help.
I think it will take quite a while to turn it into a field.