Thanks for the good info bro, i have a couple questions.
What kind of tubing is that and where is is readily available?
What size is it and how many can you stack before issues occur?
I like the idea.
These were made from flag pole only about £40 for 20 ft , it was just a idea I had I think if someone wanted to go into this and make a universal one out of carbon they would be on a right little earner https://www.ebay.co.uk/itm/20ft-Flagpole-Aluminium-Flag-Pole-With-2-Flags/170590373427?epid=1140536778&hash=item27b7fa8633:g:XRQAAMXQiNdRfgNb