> ## Documentation Index > Fetch the complete documentation index at: https://docs.aliengh.com/llms.txt > Use this file to discover all available pages before exploring further. # The building suite > BIM-style modelling in Grasshopper: levels, grids, walls, openings, floors, roofs, stairs and structure, wired by name. The building suite models a building the way BIM tools do, inside Grasshopper. Set the site once, add levels and grids, and every wall, slab, stair and beam afterwards knows where it sits. Change a storey height and everything above it follows. The vic_site_map component wired into the levels component on the Grasshopper canvas, with building massing in the Rhino viewport above ## How the pieces connect Components pass elements to each other as **records**: one line of JSON text per level, grid, wall, slab or member. Any component, a Grasshopper panel or an agent can read them. Wire them by pin name: ```mermaid theme={null} flowchart LR site[Site base] --> levels[Levels] site --> grids[Grids] levels --> walls[Walls] wt[Wall types] --> walls walls --> doors[Doors] --> windows[Windows] levels --> cw[Curtain wall] levels --> slabs[Slabs] st[Slab types] --> slabs levels --> roofs[Roofs] rt[Roof types] --> roofs levels --> stairs[Stairs] srt[Stair types] --> stairs stairs -- voids --> slabs stairs -- edges --> bal[Balustrades] bt[Balustrade types] --> bal grids --> bc[Beams and columns] levels --> bc bc --> se[Structure edit] --> cn[Connectors] ``` Select **Levels** and **Grids** and describe "a floor slab at every level inside the grid". The new component is built beside them, already wired, and reads their records for you. ## Types and elements Most elements come in two parts. A **type** component says how it's built: the layers of a wall, slab or roof, the construction of a stair, the style of a balustrade. The element component places it. In the next beta, every type component has a **Save** button that adds the type to the panel's **Objects** library, with a thumbnail, so you can reuse it on the next project. ## The suite Named levels with RLs, and Revit-style grids with bubbles and dimensions. Layered walls from Australian build-ups, hosted doors and windows, curtain walls. Slabs with openings, hip and gable roofs, stairs between levels, balustrades. Next beta. Frames from real Australian sections, edited by pattern, with connections and a schedule. This is a first pass at BIM-style modelling. The NCC checks are first-pass design checks, not certification. Some things aren't handled yet: openings don't see walls that butt into their host, pocket doors don't cut a pocket, stairs have no winders, roofs over courtyards and roof-to-roof joins aren't handled, and there are no schedules beyond the connector schedule. This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.