Construction progress of WEAVE: the next generation wide-field spectroscopy facility for the William Herschel Telescope - Dalton, Gavin; Trager, Scott; Abrams, Don Carlos; Bonifacio, Piercarlo; Aguerri, J Alfonso L; Aguerri, J Alfonso L; Vallenari, Antonella; Middleton, Kevin; Benn, Chris; Dee, Kevin; Sayede, Frederic; Lewis, Ian; et al. (Proceedings Of Spie - The International Society For Optical Engineering, 2018)