To what dimensions can you cut to. I have a pretty specific requirement.
If you need help in explaining my topographical map feel free to ask.
The red should be 8 inches not 6. Oops. Finally, It would be awesome if you told me how much this thing would weigh...I'm not sure how dense shale is and this is a big hunk. The gradient slope should be about 2" sloping downards until the 2" thick base. so a rather sharp cliff-like structure.
It can be broken apart to fit the box. Actually that might take up too much swimming space... hmmm I might want to make it 8" x 12"