Fountain - > pool

Slow progress is slow.
Made what was going to be a fountain into a kind of "pool" (obviously it would have a water texture in it)
I probably overcomplicated the process as I;
Made a box
Copied that box, raised it above the previous box and then changed the dimensions appropriately.
Turned the box on the top into an editable poly and then selected the inner polys and extruded those to create a "pool".
However the sides became 2 dimensional so i selected those and did a face extrude ( 5.0 extrusion ) to finish it off.