Abstract: A modular form panel for assembling a cast-in-place concrete structure includes an inner panel section and an outer panel section. A filling gap is defined between the inner and outer panel sections. The filling gap is configured to receive concrete poured on-site to form a concrete wall or roof section. One or more tie members span the filling gap interconnecting the inner and outer panel sections. The panel includes an integral side flange in some embodiments. When multiple panels are positioned adjacent one another, the adjacent side flanges form an end gap on each lateral side of the panel. The end gap has a thickness greater than the filling gap thickness. Concrete disposed in each end gap forms an integrated support column on each side of the panel. A bond beam gap is defined along the top edge of the panel having a greater thickness than the filling gap.