There are two ways of dealing with the joining of the forward and aft fuselage sections with an open cutout for the cockpit and when to install the tub.
The main issue for me is that if the cockpit is installed first, then the fuselage joints become blind and hard to fit together.
So here is option 1 dry fit attaching the cockpit tub first
option 2 is to attach the fuselage halves first
I decided to glue the forward and aft fuselage sections first. This way, I can align and press the glue tabs from the inside.
Now glue the mid frame and slip the cockpit tub under the forward instrument panel.
After dry fit, glue in place. The tub is flexible enough to allow it.
Isaac