EFCS Van Allen originally was build as colonial ship, late modification of Patriarch class. She was almost ready when huge colonization programm had been canceled due to deep political crysis. For several decades this ship was drifting in orbit without any purpose. Van Allen was partially disassembled, most valuable modules as reactor or hypercore were removed. Finaly, her empty shell was sold out as scrap. However new owner from one of peripheral colonies decided to rebuild Van Allen as construction ship. Due to lack of finances old equipment was used. Artificial gravity ring was replaced by radiation sheild to protect crew from old unsafe reactor and engine. Most secondary systems also were outdated or missed. Despite this Van Allen is still valuable costruction ship capable of assembling key sctructural parts of space stations or supermassive ships. About one third of outer rim's trade hubs were build with help of this ship.
EFCS Van Allen by Sunder_59, on Flickr