A structural module, comprising: a first strut pair comprising a first strut and a second strut pivotably connected to each other at a first strut pair pivotable connection point disposed along a middle half of each of the first strut and the second strut; a second strut pair comprising a third strut and a fourth strut pivotably connected to each other at a second strut pair pivotable connection point disposed along a middle half of each of the third strut and the fourth strut; a first hub, a first end of the first strut and a first end of the third strut being pivotably connected to the first hub; a second hub, a first end of the second strut and a first end of the fourth strut being pivotably connected to the second hub; characterized in that the structural module further comprises: a stop (45, 45') comprising a first and a second stop strut (47, 49) pivotably connected to each other proximate first ends (471, 491) thereof to at least partially define an abutment end of the stop (45, 45'), the first stop strut being pivotally connected at a second end thereof to the first strut and the second stop strut being pivotally connected at a second end thereof to the third strut, wherein the structural module is movable between a closed position in which longitudinal axes of struts of the first strut pair and the second strut pair are substantially parallel to one another and an open position in which the abutment end of the stop (45, 45') contacts the second hub. a first strut pair comprising a first strut and a second strut pivotably connected to each other at a first strut pair pivotable connection point disposed along a middle half of each of the first strut and the second strut; a second strut pair comprising a third strut and a fourth strut pivotably connected to each other at a second strut pair pivotable connection point disposed along a middle half of each of the third strut and the fourth strut; a first hub, a first end of the first strut and a first end of the third strut being pivotably connected to the first hub; a second hub, a first end of the second strut and a first end of the fourth strut being pivotably connected to the second hub; characterized in that the structural module further comprises: a stop (45, 45') comprising a first and a second stop strut (47, 49) pivotably connected to each other proximate first ends (471, 491) thereof to at least partially define an abutment end of the stop (45, 45'), the first stop strut being pivotally connected at a second end thereof to the first strut and the second stop strut being pivotally connected at a second end thereof to the third strut, wherein the structural module is movable between a closed position in which longitudinal axes of struts of the first strut pair and the second strut pair are substantially parallel to one another and an open position in which the abutment end of the stop (45, 45') contacts the second hub. a stop (45, 45') comprising a first and a second stop strut (47, 49) pivotably connected to each other proximate first ends (471, 491) thereof to at least partially define an abutment end of the stop (45, 45'), the first stop strut being pivotally connected at a second end thereof to the first strut and the second stop strut being pivotally connected at a second end thereof to the third strut, wherein the structural module is movable between a closed position in which longitudinal axes of struts of the first strut pair and the second strut pair are substantially parallel to one another and an open position in which the abutment end of the stop (45, 45') contacts the second hub.