Thanks. I stayed up all night one night making that. It was done for a thread about retractable boattails. The scalloped edge is deprecated, it was to be a self-inflating feature.
The cooling (intake on the sides, exhaust on the bottom) is uncompromised. There's no consideration of engine access in the model.
I was showing it for the connection between the Gothic arch and The Template. Here's a similar example, a double-walled inflatable on a variable-wheelbase tricycle:
