In order to complete your joinery, get a better look and a new aesthetic dimension of the windows, you have at your disposal a varied selection of windowsills and window boards. They are actually a profile that has a shape adapted to receive water from the window and to reflect it away from the facade. They are suitable for flowerpots.
They can be installed on the inner and outer side of the window and the thickness of the windowsills is 20mm. The standard color of the windowsills is white, but on your requests, it is possible to manufacture them in other colors as well.
Boards can be PVC or ALU.