Modular wall assembly system

Provided are systems and components for modular wall assembly. The components include horizontal tracks, vertical studs, and floor tracks that have engagement means for assembling the components together into a frame structure. Horizontal tracks and floor tracks have portions for mourning a wall module such as a wall panel unit, bookshelf unit, or cabinet. The horizontal tracks, vertical studs, and floor studs may be CNC cut from a CAD file for precision alignment between interlocking components. The modular wall assembly systems provide for ease of construction and flexibility in designing the layout of an interior wall.