A unique Research Infrastructure for testing fusion material in realistic conditions is getting underway. The EU-funded DONES-PreP project is the preparatory phase for IFMIF-DONES, which is a novel research infrastructure based on a unique neutron source with energy spectrum and flux tuned to those expected for the first wall in future fusion reactors. As such, DONES-PreP will address financial, legal and organisation aspects for the construction of the IFMIF-DONES in Escuzar (province of Granada, Spain). It will draft the consortium agreement allowing for the construction of the facility in Granada. The preparatory phase is considered a suitable framework to attract other partners, to ensure the operation and exploitation of the project, such as the already confirmed Andalucía Region Authority and the Spanish Government, EUROfusion and F4E.