Hello can i use this with a chair with 4 legs i cant but that Ikea chair in my reagion and is it competitive for planes and dogfights ?

I have been unable to find the tubing required for the various components in the USA for a reasonable price. I have found flat stock in 10mm x 10mm and 10mm x 20mm for less than $20 US for 4 pieces each size. Will solid flat stock work in place of tubing? The only difference I can see is in drilling holes. I am waiting to purchase a 3D printer and get started. I have sourced all of the components except the tubing. I am very new to 3D printing and have reviewed all of the documentation you have provided. Thank you for all of the time you spent creating and posting all of that information and with great pictures.

Yep You have convinced me to make this one :)