I like to go outdoor ... and i like to camp there. In a wilderness fire is mandatory .. protection.. warm ... light. But safety on the first place. So against open fire, I assemble a small take dawn stove...it concentrate heat on spot
Ideas on paper and after on metal sheets. Cut it in isosceles triangles. 3+1 pcs an 1 small triangle and 1 small square. I use a 1 mm thick material, Simple iron sheet. Then I cut out hinges on 3 sides...and it stay up as predicted.