Calculation and construction of metal structures in the Business Center

Good afternoon, dear experts. We are planning to reconstruct the roof in the business center, whatever in the modern style. The total volume of the roof is in the area of 450 squares, plus the facade of about 130. Maybe a little more, maybe less... We think about light-transparent structures on the power frame. I would like to get the most affordable and affordable material. As I think, it should be either Polycarbonate, or polyvinyl chloride, or polystyrene, or acrylic glass, well, in extreme cases, glass triplex. Send your suggestions, I will answer everyone. Write what you need from me to start calculating the loads, the structural part and the architecture itself. I'll send it to the post office. I am waiting for all the appropriate proposals. In choosing a contractor, the priority will be: - Knowledge in the calculation of load-bearing structures, competent approach, efficiency in execution, and objectivity in the evaluation of work. I wish it were cheaper. I'm waiting for suggestions now.