Following with the fuses...some pics of several steps of the process.
Note that there is no difference with the way you build any classic fuselage, but the size and perfection of the alignments make the task enormously difficult.
The crutch ready to receive formers and stringers
Gluing the wing base reinforcements
More and more stringers. This time gluing the gear doors ones
One fuselage ready to be sheeted
As I said in a post above, I recommend building both fuselages at the same time, in two different workbenches. You will save a significant amount of time