80 Juggernauts...deployed to destroy Capella. It doesn't mean their max number of Juggernauts is 80 
what about material issues? if you need some sorta super rare metal to use in a dangerous chemical reaction that could kill shivans both aboard the ship AND during construction just to power the thing, then yeah, I think there (or is it their?) would be issues.
The Lilith is heavily armored and has one LRed beam. There's nothing about it that implies gathering rare materials...
there is nothing to
imply that it has rare metals or somesort, but that is really the only explanation for having such a powerful ship and not building a lot of them.
besides there has to be a reason that you can't put a lred on a small ship. my guess would be that small generators are not powerful enough to make a beam like that. so, on a lilith they use a very advanced , dangerous and costly (in terms of rare materials) generator.
Good point about the material, maybe it is incredibly rare...so that there aren't ships larger than a cruiser protected by it. Who knows...
well the only time I can remember a lilith is when you had to capture it in fs1. maybe the shivans
wanted it to be captured. they left their best tech for us so that we wouldn't resist taking it. remember what happened to the station that took it, right? it was just so that the shivans would find the GTA's best, nearby base so that they could come and destroy it.
heh, or maybe the shivans are just playing with us...