Okity dokitey artichokity. This thread blew up with all the force of a thermonuclear bomb.
106 miles is insane for a ship. Like, Multi-kilometer vessels are alread ridiculous unless you're talking a pre-FTL antimatter based starship in which case it needs to be really huge. But 106 MILES? 106 METERS is a small destroyer. I'm okay with giant-ass superstructures but not warships that are 100 miles long. Thaaaaats too big. Even as an ultimate boss that you need a coalition to take down that's too big. Like 10 miles is the absolute maximum or some shit like that.
Honestly though? We don't need no numbers. "Holy shit that thing is huge" is good enough. "It's the size of Rhode Island!" We don't need to measure and compare our starships that definitely are not gigantic rods with a huge gun going down the middle. In the end though, make your ships smaller. They can still be insanely huge but not so huge that they fly over a planet and everyone goes "oh hey a lunar eclipse". The UU is based on insane quality but no quantity, which is fine. Just don't make things ridiculously huge.
Big doesnt necessarily mean "immune to weapons any sensible Type 2 civilization has" a 106 mile starship without some kind of defense system Can still be damaged by Space-Weapons such as relativistic mass drivers or Antimatter missiles, or kamikazi at relativistic speed.