The optimal topology of large structural systems has until now been concerned with the design of individual parts and not that of complete assemblies. Following recent advances in numerical algorithms tailored for large-scale structural optimization, this limitation has now be circumvented, mainly by utilizing powerfull HPC systems. The giga-scale design approach have been demonstrated on examples covering aircraft, bridge and ship design problems, all resulting in noticeable performance enhancement. A common observation for topology optimized designs (true for giga-scale as well as small-scale results) is a highly intricate geometric layout. Such geometries can often not be realized by conventional manufacturing methods, which naturally leads to the field of additive manufacturing. In fact, topology optimization and additive manufacturing forms a near perfect match, in which the design freedom from the material distribution methods complement the geometric freedom provided by 3D printing and vica versa. Therefore, many obvious directions for further extensions and research exists, with one of them being the design of optimized coating and infill patterns for light weight constructions. The final part of this presentation will cover the so-called coating and infill approach, and several examples will be presented in both statics and dynamics including experimental validations.