I would recommend you scrap all them plans gaz put 1ft of top quality top soil all over and get kanny and BGD around.to plant the lot in high grade super skunk lol
My missus likes that idea King. Hahaha.
I'll have a truck round with the top soil first thing in the morning pal
Sorted BGD.we will have gaz garden looking great in no time.Right I will get the seeds under some damp tissue paper.
Gaz leave that gravel there it will be good for drainage lol