I haven't thought this through, but it would be fun to see a base that's mostly javelins - imagine a clump of 14 of them shelling out 2.5k dmg / 12 sec. Even with some getting killed/sniped, I think any fleet would be hard pressed to travel the length of a channel in 60sec.
Even with 60% balistics negate + say 50% evade, it still does 20% of the dmg, so 500k / shot * 14 javelins = 7k dmg / shot assuming all are in range.
Seems even MCX would have a really hard time with this:
1) Javelines shoot, killing 1 MCX before they are in range
2) Guessing 4 MCX kill 2 towers
3) 12 Javelines shoot, killing 2nd MCX
4) 3 MCX kill 2 towers
5) 10 Javelines shoot, mortally wounding 3rd MCX
6) MCX kills 1 tower
Soon I think all the MCX are dead in about 1.5min unless they can get through a channel fast enough, but it doesn't seem likely.
That said, this would take 140d of build time to refit + attacks slowing down. Kinda fun to think about though.