Aye, you've guessed it - next in line is the USS Bellerophon, presumably named after the mythical Greek hero. This Nebula class ship is a monster! I'm using a design for the USS Sutherland which
is tagged modelosdepapel.com.ar and is by "Edward" - I can't recall
where I found it. I started with the ventral saucer sections and
internal supports:-
Then moved to the dorsal saucer sections:-
Trying to join the halves with the internal supports and the gazillion
tabs on the lower half proved to be impossible - I ended up with a warped mess. I
had to trim the internal supports to practically nothing and completely
remove the outer ring (which was supposed to be notched, folded over
and joined to the upper disc). I reprinted the lower disc, cut round the
outer ring, joined it to the rim of the upper half then attached the
lower half. This kept the saucer edge smooth and the discs unwarped.
With that done I moved on to the pod, purely because it has the next
largest pieces:-
By my standards this ship is huge - I haven't measured it yet, but the saucer must easily be a whopping 3 1/2" wide.
This design is posing problems. There are loads of notched tabs that have
to be glued and then folded under with no way to apply pressure to make
the tabs stick. However, despite the vast number of notched tabs and the lack of purchase when
gluing them I might as well persevere with it since I only have
the nacelles left to build. It's slow going because I can only affix two
tabs at a time and I have to leave time for them to dry before moving
to the next two.
I constructed the pod and cut the pieces for it's support structure:-
At first glance the support looked like it would be murder to join up,
but it went together easily enough. The next section I worked on was the
secondary hull, again with those bizarre notched tabs:-

For the lower half of the secondary hull I removed the tabs and used
strips of paper to join the pieces. With most (if not all) of the other
ships I could remove all the tabs, but the unique design of this model means that I've had to retain the vast majority of them.
The nacelle pylons joined up really well and the design gave exactly the right shape for attaching the nacelles and pod support.
I trimmed the tabs off the curved edges to maintain the correct profile
and avoid 'bulking up'. The nacelles were the last parts to be
constructed:-
I discarded the white ovals as I felt they were surplus to requirements.
The tabs from the ends and the bussard collectors were removed and I
joined everything with internal paper strips as usual. A cocktail stick
helped in curving these pieces. Then all the sections were put
together:-
All the other ships are dwarfed by this beastie:-
The Bellerophon is only slightly longer than the Yamaguchi - it's the width that makes it such a monster.
Well that's only the USS Chekov left, unless I can find room for some
random ship pieces and spaceagent's proposed 'Planet of the Titans' Enterprise.
The Chekov seems to be another Galaxy class kitbash with parts from the
Oberth and Cheyenne classes - hull support pylons and marker pen
nacelles, respectively. The rest will need to be scratch built. Oh
goodie! lol.