Created the PETG version.

The most miserable part of assembly is creating the heat break.

It might be possible to use a big old blob of caulking as an insulator directly on PETG.  There might be other materials, but they cost money.

This kind of welding system has a bead on 2 axes, which makes it surprisingly rigid, but it's damn hard to align without a jig.  The welding panel also engages the clamshell.

The catching system may not attach to the chopsticks, after it's heated & deformed. 

By using smaller holes & covering more area on both sides, lions believe the ventilation system looks less like windows & more like a ventilation system.  It was decided that holes on both sides should create a film cooling effect.  It's going to  lose the effect of a smoking heat shield, but no-one really knows if both sides won't smoke in reality.

This one looked especially good.  There was a moment of pride in it before the melt test.  Would increase the wall thickness to 1.5mm or add vertical stringers between the holes.  Thicker walls would reduce the airflow.

The holes seemed to diffuse the rising smoke more & cause the backflow to be emphasized.  The engine section raised on the test stand has been a lot more visually appealing than the engine section flat on the table. 

It once again softened & warped.  Vertical stringers should reduce this, but hanging it from the chopsticks should be a game changer.  The loads won't go through the deformed section.  Kind of disappointing that 50mm isn't making any obvious difference.