Abstract: A system for positioning and blind marking construction material panels includes clips designed to support marking projections relative to installed construction components such as electrical outlet boxes and frames for windows and doors. A leg flexure of each clip is used to secure the clip to thin walled components. Each of the clips further has alignment projections that abut the component edges, for securely positioning the clips. The flexure legs break away to enable use of the clip on thick walled components, with an adhesive retaining the clip in lieu of the leg flexure. The system further includes stabilizers for aligning an unsecured panel in parallel spaced apart relation to a previously installed panel, thus to edge-align the panels for precise placement of markings on an inside surface of the panel to be installed.