A deployable assembly can be positioned within a building for a datacenter or other environment. An upper frame can be released from the deployable assembly and lifted to allow lower ends of the upper frame to be coupled with upper ends of columns that also form part of the deployable assembly. The deployable assembly can be laterally expanded to extend horizontal members, such as in the upper frame and/or in a core chassis that may further form part of the deployable assembly. The lateral expansion can reach a size suitable for a cold aisle corridor, for example. The core chassis can be raised into a raised position within the upper frame, for example, such that trays within the core chassis are suitably positioned for receiving cabling from computing components to be arranged along the cold aisle corridor.