I want to build a small scale (8ft x 18ft x 10ft) model of a brutalist style poured concrete building. It will be a temporary structure, and I need to build it out of a material that can be broken down and removed quickly. I want it to mimic the seamless structure of the actual building, so a poured material would be better. Matching the main features and general feel of the building is more important that minute details. Any suggestions?
Here is the building:
Here is the building: