Quest X-30 Aerospace Plane Part 10, Bulkhead & Shroud Adjustments

Sand the bulkhead edge to the angle of the shroud walls.
You don't want the bulkhead edges visible from the outside of the shroud walls.

From the rear, this is the rear bulkhead pressed forward as far as it could go without deforming the shroud.
The instructions say the smaller forward bulkhead should now be even with the front of the shroud.

Here's the front bulkhead, obviously not even with the front edge of the shroud.
Careful rear bulkhead adjustments will have to be made.