forming the tubes

The tubes were fairly simple to make 3D once the drawings had been completed. The drawing was copied and pasted onto multiple planes at repeating height differences. The individual circles were made into profiles and then from the set of 4 (ground, roof, and two center 3rds) i was able to made the individual solid tubes. The the solid was transformed into a shell using the shell command and selecting the top and bottom surfaces and defining a thickness to the structure.