I built my first ship intended to travel to and return from Jool. Ideally it will land on one of the smaller moons, but we'll see. This is the Tempest 1. I've devised a system for increasing my delta-v by dropping off fuel tanks as they are used up. Fully assembled, I get a bit over 9K delta-v. I'm pretty excited to see how well it works -- or how spectacularly it fails.