BIM Model Updates & Federation

I am working with 1,109 villas that were originally documented in 18 separate BIM files—Architectural, Structural, and MEP. All three disciplines now require a full refresh to match the latest 2D As-Built drawings, which I already have in both DWG and PDF... (Budget: $10000 - $20000 USD, Jobs: BIM Coordination, Building Information Modeling, Revit, Structural Engineering)