A manufacturing system for modular building panels includes a building information modeling (BIM) system that generates specifications for frame members including cutout locations and determines lengths for building services. A roll forming machine creates fabricated frame members with cutouts according to the specifications, where the roll forming machine may include stations that create cutouts based on data translated directly from BIM building service features. Modular panels assembled using the fabricated frame members include building services cut to the determined lengths and routed through the cutouts. The building services may be flexible or rigid, and the modular panels may be open on at least one side for inspection. The BIM system may determine building service lengths based on routing paths through multiple modular panels and may define connection points between modular panels where building services cross between panels.