Two-Level Floor Plan Revisions

I have an existing 2-D commercial fit-out plan spread over two levels that now needs a round of concept-stage tweaks before it accompanies a grant application. The core drawing is already complete, but... (Budget: $30 - $50 AUD, Jobs: 2D Drafting, AutoCAD, Building Architecture, Building Design, Building Engineering, CAD / SolidWorks, Drafting, Floor Plan, SketchUp)