A structural assembly has elongate members extending at angles to one another from connector members and forming with the connector members a lattice structure having open spaces defined by the elongate members, with the connector members at corners of the open spaces. Tension members extending between the connector members have opposite end portions extending through the connector members to anchor members on the tension members. Adjustable fasteners retain the anchor members on the end portions of the tension members and the anchor members are distributed around the connector members, with each of the anchor members in a respective one of the angles in wedging relationship with a pair of the elongate members.