Abstract: The present invention discloses a modular fabrication panel unit comprising a horizontally-disposed corrugated gypsum board core, the corrugation forming a series of truncated crests and troughs, framed and braced by substantially U-shaped channel supports formed of structural steel, corrugated core and supports then being sandwiched between panel skin comprising either plywood or gypsum board, depending on whether the panel is to be used as a section of an interior wall, exterior wall or roof. The panel skin is attached to the flat outwardly-facing surfaces of the core formed by its truncated corrugation. The modular fabrication panel unit of the present invention may be manufactured utilizing inexpensive machinery and nonspecialized manual labor, either on-site or in a factory situation. The modular fabrication panel unit is a low-cost, low-maintenance, fire-retardant, structurally sound modular construction member having good insulating and acoustical properties.