Just bought one of the new HK 250mm FPV Racing Ghosties ... Pretty cool little quad for the money. Should be fun bombing around at dusk and beyond! After looking around for a build guide, and finding little to no information, I did a short and sweet assembly walk-through and posted it over on the Multirotor Pilot Magazine domain.
HobbyKing FPV250 V4 Blue Ghost Edition LED Night Flyer FPV Quad Copter - The Build