Some embodiments of the present disclosure include a structural attachment system for easily and quickly erecting a structure. The structural attachment system may include a hollow tube unit having at least one T-slot positioned between a pair of square slots configured to engage with a unit connector. The unit connector may include a T-unit sandwiched between a pair of composition units and a pair of locking plates. The T-unit may have a first unit T-tab configured to engage with the T-slot on the hollow tube unit, and the locking plates may engage with the square slots, resulting in the unit connector being slidably fastened to the hollow tube unit. Paneling may also be attached to the hollow tube unit to create walls, a roof, and flooring.