A wall forming structure is disclosed, where very large panels may be formed having sheathing placed against a plurality of studs which are, in turn, secured to at least a pair of strongbacks where the strongbacks comprise a pair of channel-shaped members in spaced back-to-back relationship. The panels are placed in opposed relationship to form a cavity into which concrete is placed to form a wall, and the panels may each be moved as a single unit -- depending upon their overall size. Indeed, using suitable spacers, the entire wall form may be constructed away from the place where a wall is to be formed, and be lifted or moved into place using suitable handling equipment such as cranes. Each strongback comprises a pair of channel-shaped members where there is an outwardly facing T-shaped slot formed in each side wall of each channel, and a pluraity of plates each having an opening through its thickness is secured to each pair of channel-shaped members at each place where a tie will extend between the panels. Generally, the channel-shaped members of the strongback and the studs which are secured to the strongbacks and to which the sheathing is secured, are extruded aluminum.