MEP Ducting AutoCAD Revisions

I already have a complete set of AutoCAD drawings; the architectural and structural backgrounds will stay as-is. What I need is a focused round of revisions to the MEP ductwork:

• Re-work the duct layout where clashes or coordination issues exist.
• Add or remove ducts in line with the latest red-marked sketch notes.
• Update all duct sizes, airflow specs, layer naming and annotation so schedules remain consistent.

Please keep the original drawing standards—layers, linetypes, title blocks—while inserting your changes on clearly named revision layers for easy tracking. Deliverables are the updated DWG files along with a plotted PDF set showing the revisions clouded. I will supply the current model, mark-ups and specification sheets once we start; just let me know if you need any additional reference files.