Dan's Jelly "Pseudokreisel"

[sphelps]

I'd use an oven for the bending, a heat gun on that size of sheet will likely give less than steller results.

170°C should work well for cast material but don't use a gas oven. For best results build a wood mold with the right curvature and place the sheet on top of it in the pre-heated oven. The sheet will form around it by itself.