We require a qualified structural engineer to do the structural calculations and design of a proposed two story residential development project. The simple (11m x 17m rectangular shape) energy efficient design has a gambrel roof (30 degree) and the design drawings are drawn in Revit Architecture. The construction type is "Dincel construction system" ([url removed, login to view]) with 200mm thick exterior concrete walls, 110mm thick interior concrete walls and 150mm thick concrete floor/ceiling slabs. The proposed home has a mezzanine floor and attic space. The roof structure needs to be designed in a cost efficient manner for a steel colour-bond roof. The structural engineering design/calculations for this project must be complete and meet current Australian building codes.