Best Grabber build I've seen, but still suffers from the fact that a Velvet Storm has only half the offensive (combat) and defensive (resist) power of a Vanguard and about the same as an upgraded Auto Turret.

With 3 Vanguards and 3 Auto Turrets I've got your 3 Velvet Storms outgunned 3:1. And that's without my Drachian Mantis's combat power (assuming it is usable landed).

Accepted military doctrine requires an attacker to have a 3:1 advantage over the defenders in an entrenched position to be successful.

So you're at least 9x short of the combat power required to land your 3 Vanguards on my Island to take on my 3 Vanguards. This is assuming a Velvet Storm's 1 cargo slot can fit a Vanguard and still have enough energy to fly.

If my Keeper base was accessible by land it would be a fairly even contest, but it isn't.