Decided to go non-caveman for now. The new contracts added by 1.0.5 make stuff interesting, but by simple farming you could achieve caveman. Trying to do the challenge has been very educational though. I managed to get a satellite into munar orbit without any flightplanning etc, which was great. However, Since I only started with KSP about 2 Months ago, I feel like I have to earn more experience before attempting to do the challenge properly.