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Pick a public typology and a budget. The budget scales both the size of the building and the quality of the build — plate resolution, glazing share, shell and fit-out spec.

The geometry is deterministic: a Goldberg plate layout, the dual of a subdivided icosahedron. The same configuration always produces the same building, with its bill of materials, cost and time estimate.

1. Plate shell idea
2. Fixed geometry
3. Robot that drives
4. Checks outside
5. Award bands

A plate is only placed if it touches the foundation or a neighbour that is already built. No floating parts.

Three checking scripts run outside the app: shell and sequencing invariants, plate reachability from the robot stations, and the procurement thresholds for both federal states.

The robot cannot reach a whole shell from one spot. It is modelled on the ETH Zurich In-situ Fabricator at realistic scale, about 3.5 metres of arm reach.

So it drives. A set-cover planner picks work stations, and a depot with an on-site mill sits in the middle. Accepting the reach limit is what turned a rendering into a construction sequence.

For the sake of complexity we also dropped more realistic physics and collision models.

A rule engine maps the configured budget onto the German public-procurement award bands at the 2026 thresholds, from direct award up to the EU-wide procedure. The Berlin and Brandenburg obligations are included.

It renders as a clickable ladder, so a change in budget shows immediately which procedure the project falls into.