I just used what rvm --rvmrc --create gave me. Does it need to be refactored? Also, I understand you want it to run on RBX, but in reality, I think it would be best left at MRI right now. Easier way of entry for future collaborators. Most will have MRI, not RBX. We need to make sure it runs on RBX (and JRuby) but I think the MRI default will be better.