tubular canopy frame 3d model

Create an empty tubular steel canopy frame only. Do not generate cars. Do not generate people. Do not generate fabric. Do not generate roof sheets. Do not generate floor platform. Do not generate walls. Do not generate boxes. Do not generate cage structures. Do not generate text or dimensions. The frame must look like a long rounded-rectangle tunnel made from smooth galvanized round steel pipes. Shape: - long tunnel canopy - open front - open back - open sides - wide and low proportion - rounded top corners - straight horizontal roof section - not a cage - not a box - not a container - not a house - not a room frame Structure: - 9 large portal arches - evenly spaced along the full length - arches connected by long horizontal steel pipes on both sides - arches connected by long horizontal steel pipes on the top - simple clean fabrication-ready metal structure - pipe diameter about 40 mm Exact proportions: - internal length 15.88 m - internal width 2.41 m - internal height 2.15 m