The seat cushion tutorial is in the works, but in the meantime, here are some final pictures of the interior, a lot of which will not be very visible.
The white tabs will support the instrument shelf. Some test fitting indicated the sides will need to be spread wider to accommodate the top and get flush sides. May just be an issue with my model.
A couple more things to prep before the fuselage goes together.
I have put the engine covers on the fuse top.
And the tail skid with a PE part from PART.