I love ejection seats and the flying contraptions they usually reside in. In fact, I like them so much that I want to make my own, despite my profound lack of training and inexperience with mechanical engineering in general. After doing a little research into the materials for my ejection seat, I found a large collection of aluminum alloys to choose from. Some are fairly simple to eliminate like the 1000, 2000, and 3000 series. However, between the various grades in the 5000 and 6000 series, I have a lot more trouble.
I read that 6061 is the most common alloy for reasons of weldability, corrosion resistance and a few properties. Also, I intend to rivet the chair together because that's what I see in my detailed source pictures though I have a little experience with TIG welding so that may be an option too.
In the benign environment of my office, will it really matter which alloy I pick? Can I just use common 6061 sheet or is there a better, cheaper alternative?