I figure i will need about 40ish feet of pipe. That's 4- 4' Uprights 2- 7' cross members and a little extra for intermediate supports and according to an online metal site i will be spending $200. Thats for 1.9" OD aluminum pipe with a 0.145" wall thickness.
I also learned something new. Tube is more expensive than pipe. Way more expensive. 40' of 2" OD tubing is $1500
It also says on the website that "pipes are passageways, and tubes are structural", yet further down it says
Pipe is generally more rigid than tube, and is usually produced in heavier wall thicknesses. 