Seeking Advice: Construction Suppliers Australia (Steel)

Hi All, I am hoping to tap into the combined knowledge of Procurious members in my search for Suppliers. Is anyone able to please recommend any Suppliers able to build an elevated steel substructure? This is for a commercial project (in Australia), and fairly substantial in size with the structure being elevated and required to support a Data Centre. It would be preferred if the Supplier performed the work and did not Subcontract further, and had any experience with Government projects. Any assistance is greatly appreciated! Thanks.