In what follows, we first describe the reference test systems in Section 2, along with our GA implementation. After presenting the computational details and the investigated surrogate models in Section 3, we provide a quantitative assessment of their cost-accuracy performance on a test set of GPGG structures in Section 4.1. Respective GA results are then presented in Sections 4.2 and 4.3, and their computational footprint finally reported in Section 4.4, before drawing conclusions in Section 5.