Create an architectural nine-square-grid plan.

Input parameters:

1. Bn → Boundary rectangle within which the 9-square grid will be laid out.
2. R1 → Relative weighting of the first row.
3. R2 → Relative weighting of the second row.
4. R3 → Relative weighting of the third row.
5. C1 → Relative weighting of the first column.
6. C2 → Relative weighting of the second column.
7. C3 → Relative weighting of the third column.

Output parameters:

1. S00 → The cell in the bottom left of the grid.
2. S01 → The cell in the bottom middle of the grid.
3. S02 → The cell in the bottom right of the grid.
4. S10 → The cell in the middle left of the grid.
5. S11 → The cell in the middle middle of the grid.
6. S12 → The cell in the middle right of the grid.
7. S20 → The cell in the top left of the grid.
8. S21 → The cell in the top middle of the grid.
9. S22 → The cell in the top right of the grid.