... we do in the frame of first contact with customer to define the basic aims of steel construction, especially for simple halls and penthouses. Preparation of layout documentation is based on already realised projects from our database so that the estimate of weight (including differences for aimed purpose) was very accurate. Preliminary estimate of weight is also important for consideration of financial side of supplier´s aim. Offer drawing also enables customer to obtain visual idea of his aim and in case of need to make possible correcton or to add necessary parts to fulfill the project´s aim.