Strutucture of a bridge

i have a little project easy to make maybe 3 or 4 hours depending on the experience in solidworks, i need to make a structure like a bridge, in nylon 6.6 material, dm me for more details. translation in what comes in the photo below. - The entrance to the Mariquinhos family's country house has two tall columns, 5m apart. It was decided to develop a structure, like a bridge (see images below), in which it intended to hang the aambuzinolix chitres precisely at the height of the structure. And Mariquinhos thought quickly: it will probably be up to me to install this 'thing'. The best thing is for the structure to be as light as possible, or I'll ruin my back. And it must be beautiful, or Mariquinhas still forces me to design another one... And so as not to give the feeling of not being secure, with the weight and the wind, it was decided that, when hung, the sag in the structure could not exceed 1% of the span, i.e. 50 cm. And that's it. 'Let's go there and help Mariquinhos, he won't have to sleep in the bathtub indefinitely from midnight on January 21, 2023. AAAAAHHH, almost forgot. As Mariquinhos is a borracho (Words of Mariquinhas), the frame must be made of rubber RUBBER, LIGHT and BEAUTIFUL. And the arrow, in charge, not exceeding 50cm need something like the figure in the image [login to view URL] ps. im in changing home situation i need to finish this 20th january