I'm currently learning fillet-brazing, and I need practice. I have a pair of about 1/16 " thick L-shaped steel sections about 5' in length (I think they came from the roof of an old shed). I was wondering whether brazing bits of those together would be a good way to practice fillet-brazing without needing to cut mitres. I'm already fairly good at mitres, so I don't need too much practice at cutting them, but at the moment, I have to cut one every time I want to practice brazing. My idea is to create a 90 degree joint with the two pieces, and braze it. If I simply practice on these L-sections, would the technique be close enough to tube brazing to be useful when I finally build a frame?