This is my standard survival kit I build as soon as I have invaded first power plant (on Akua) or Xenu temple (on Omicron) as the base of operations. Every single ship in this kit are still very small and easily replaceable in both time and resources but it's pretty much all you need for survival, no matter how many planets you invade. On the first phase I usually use Mini-bomber instead of Pocket cruiser and build the pocket cruiser later on, when I can bother making enough rockets, so you if you're not as lazy as I am you can skip either ship and just use the one you made until everything is cleared. I pretty much never use any Hover vessels past level 7, since they're slow, have some bugs in hover engines, and even the slight sliding that's always present in Hv's, is something I find quite annoying :D