Abstract: A computing system may include a design space access engine configured to access a design space of a physical structure. The computing system may also include a structural design engine configured to encode the design space into a set of 3-dimensional (3D) rectangles. Each 3D rectangle may define candidate beam locations in the physical structure and candidate beam locations of the 3D rectangles may be defined by lines between vertex pairs of each 3D rectangle. The structural design engine may also provide the encoded design space as an input to a machine-learning (ML) model, generate, through the ML model, a design of the physical structure based on the encoded design space, and provide the design of the physical structure in support of manufacture of the physical structure.