ACAD PLAN MODIFICATION

Need to modify an ACAD plan to fit within survey drawings of site which is slightly different to the original drawings. See enclosed ACAD drawing and PDF. The lines in Purple (colour 210) indicate the actual site shape. I need someone to draw out the original plan within the new site extents. The shafts and back yard have dimensions indicated on drawing that need to be respected. The rooms shall need to have walls at 90degrees. Thanks