I need a complete set of AutoCAD drawings for a helical staircase, with single railing as a back side is wall, that will rise a full 11 ft from the lower floor to the upper landing of a new home. I already have the room’s height and depth; what I do not have—and need from you—are clear, build-ready details: tread and riser dimensions, exact rotation per step, total sweep angle, inner and outer radii, stringer and handrail profiles, and all connection points to the slab and upper floor. Because the material has not been finalised yet, please keep the design flexible enough to suit wood, metal or even a mixed solution; the core geometry must therefore be precise and fully dimensioned so a fabricator can adapt it quickly. If you see structural limitations with any of those materials, flag them in your notes. Scope of work and deliverables • Fully layered DWG files showing plan, elevation, sections and at least one 3D axonometric or isometric view • Step schedule table listing rise, going, cumulative angle and radial distance for every tread • PDF sheets formatted for print (A1 or A2) with clear, legible annotations • A brief design note explaining assumptions made for code compliance and recommended staircase diameter options Full guidance on material to be used, along with steps of making this. The drawing set should be ready to hand to the structural engineer and the fabricator without further editing.