After my Plock IPV came up short on Delta-V, I wanted to create something a bit more capable in order to conquer the Outer Planets system, resulting in the birth of this ginormous ship!

Its centrifuge system is more stable than its predecessor (thanks to a tip from a commenter!) and it boasts a colossal RA-2500 antenna and a 1000+Isp "Lightbulb" nuclear engine!

When paired with its three specialised Sarnus-system landers (unfortunately not present in this video), it has a mass of four to five hundred tonnes and a luxurious seating capacity of over 150 Kerbals. It has over 11,000m/s of Delta-V without payload, and still has enough to transfer from Tekto all the way to Hale despite its Sarnus-5 fleet weighing in excess of a hundred tonnes combined (but returning to Kerbin is a different story...)

KJR Continued, Atomic Age and Extended Antenna Progession made this behemoth (nicknamed "Dragonfly") possible!