Plumbing Plans for Taperoo Flat

I’m adding a small, self-contained flat to my home in Taperoo (postcode 5017) that will be used for everyday residential living. If possible Flat to be built on stumps (not Slab), I need complete, council-ready... (Budget: $250 - $750 AUD, Jobs: 3D CAD, AutoCAD, Building Architecture, Building Design, Building Engineering, CAD/CAM, Drafting, Plumbing, Revit)