A concentrating solar collector module comprising: a reflector having a reflective front surface shaped to concentrate incoming solar radiation onto a focal line, the reflector having two lengthwise edges (203a-b) parallel to the focal line and two ends defining the length of the reflector; first and second rails (205a-b) disposed parallel to each other, one rail attached to the reflector at each of the lengthwise edges (203a-b) and extending substantially the length of the reflector; a set of truss connectors (206a-f) attached to the rails (205a-b), the truss connectors (206a-f) and rails (205a-b) comprising ways that enable constrained sliding engagement of the truss connectors along the rails (205a-b) before attachment of the truss connectors to the rails (205a-b); a plurality of framing members connected to the truss connectors, wherein the framing members and the rails (205a-b) form a structural lattice that cooperates with the reflector to lend rigidity to the solar collector module; characterised in that the set of truss connectors (206a-f) comprises an end truss connector (206a-f) at each end of each rail (205a-b), and wherein the framing members comprise two end trusses (207a, 207b), one end truss (207a, 207b) at each end of the solar collector module connected between the respective end truss connectors (206a-f); the framing members further comprising at least two diagonal framing members wherein each diagonal framing member is connected to a truss connector (206a-f) on the first rail and a truss connector (206a-f) on the second rail, the diagonal framing members crossing the solar collector module in front of the reflective surface; and wherein at least one of the diagonal framing members is configured such that it is tension adjustable. a reflector having a reflective front surface shaped to concentrate incoming solar radiation onto a focal line, the reflector having two lengthwise edges (203a-b) parallel to the focal line and two ends defining the length of the reflector; first and second rails (205a-b) disposed parallel to each other, one rail attached to the reflector at each of the lengthwise edges (203a-b) and extending substantially the length of the reflector; a set of truss connectors (206a-f) attached to the rails (205a-b), the truss connectors (206a-f) and rails (205a-b) comprising ways that enable constrained sliding engagement of the truss connectors along the rails (205a-b) before attachment of the truss connectors to the rails (205a-b); a plurality of framing members connected to the truss connectors, wherein the framing members and the rails (205a-b) form a structural lattice that cooperates with the reflector to lend rigidity to the solar collector module; characterised in that the set of truss connectors (206a-f) comprises an end truss connector (206a-f) at each end of each rail (205a-b), and wherein the framing members comprise two end trusses (207a, 207b), one end truss (207a, 207b) at each end of the solar collector module connected between the respective end truss connectors (206a-f); the framing members further comprising at least two diagonal framing members wherein each diagonal framing member is connected to a truss connector (206a-f) on the first rail and a truss connector (206a-f) on the second rail, the diagonal framing members crossing the solar collector module in front of the reflective surface; and wherein at least one of the diagonal framing members is configured such that it is tension adjustable.