Heres a ship I recently built that's canonically pretty old, the Megiteck Millennium Explorer (MTME)
The Millennium explorer class started production in the year 2195 with this particular example the Millennium voyager being launched in 2198. The ship is 105.6 meters long, 80.77 meters wide, and 20.88 meters tall and was built at New Haven Shipyards, Alpha Centauri B.
This was also one of the first mas produced ships to have a warp drive though had a very limited 10Ly of range which would take roughly 6 months to travel. The ship derives its non warp power from a nuclear energy due to fusion reactors of the time still being too large to fit into a ship of this size. It was also due to the lack of advanced heat dissipation that this ship had two massive radiator banks situated right next to the reactor.
Curiously enough this was also one of the first ships to start the trend of Megiteck ships seemingly being derived from sea creatures with many compering this model to a horseshoe crab or a triop. The designers claimed it was more of a coincidence though ever since its been a common theme in Megiteck with some ships being built directly after a sea creature.
As of the current year (3626) this ship is now 1,428 earth years old though despite the age still sees active service due to molecularity of internal components allowing ships to continuously be updated. By this point though likely the only original parts to it are the frame and then the dedication plate.
Also pretty soon i'm going to release the abridged Megiteck timeline starting from the 21rst century going up to the 37th century.