I’ve taken lengths of mild steel flat stock, heated them and bent them to the necessary angles, burned all the edges, and rough welded them all together. I then burned holes through the frames edges, behind which I laid some blue paper, seen through these burned holes. The finish was left natural to rust over time.
Image Author: John W. Waterhouse Dimensions: 22.5 x 43.5 (w x h x d) Weight: 40 lbs. lbs.