The tier 1 rocket was the easy part, recipes for the rest of the gear are a nightmare.
I was on a server that died but I got the world files for it and thus could go thru people's stuff (hehe) - one cool thing I found in someone's chest is a book by the Enchiridon (sp?) mod listing all the GT ores... that's how I discovered there are only two ore veins I didn't find in my exploring (Sheldonite and Pu244). Sorry to hear there isn't any Plutonium in the Overworld, however the book says it can also be found on (recalling from memory here) End Asteroids, the Moon, Mars, and space asteroids, so I'm certainly not out of luck. And I also realize, as dlur said, that I'll likely get more than enough Pu244 just from processing Uranium Ore itself. I was hoping to skip the whole reactor/uranium thing entirely and just go for a whole bunch of those little 16 EU/t magic boxes. hehe Obv that's why Pu244 in the Overworld was removed - precisely because of people like myself.
And that brings me on topic with my reply... yeah. Galacticraft recipes do not seem like a lot of fun, from all appearances, but that's where I'm headed for sure. The End scares me still, with the Hardcore Ender Expansion (no idea what that does to the End yet) and of course I'll need to kill the Dragon if/when I decide to go there. So it's not just a "pop in for a brief visit" kinda thing, The End. It's a major project/headache. So Galacticraft seems like perhaps the lesser of two headaches?
But no matter my words... it does seem fun to make a base in outer space, so I'm excited about it. But now I have to track down some videos and figure out how it all works, what I need, etc. From looking at recipes, I have to make the Implosion Compressor before I do anything else, and that also means I'm gonna need gunpowder. I was contemplating building a vanilla mob farm and just let it run to collect gunpowder, but I also see there's a nice recipe using only redstone dust and coal dust - both of which can be had in very large supply if I can just get my act together with mining/processing.