I've spent the last week or so trying to get this to work and having troubles with reboots before the install could complete and the install hanging around 12 minutes forever. Finally successful when I disconnected all USB and SATA drives (other than USB installer and Windows SATA drive to setup and drive to install on)
DISCONNECT ALL OTHER USB AND SATA DRIVES!
MB: Asrock X370 Killer SLI
CPU: Ryzen 7 1700
GPU: Radeon RX VEGA 64 8 GB
RAM: G.Skill - Flare X 64 GB DDR4-2400 Memory
HD1: Kingston A400 2.5" 240GB (10.13.3)
HD2: Samsung - 960 PRO 512 GB M.2 (10.14.1)