Ever want to build your own launch rail?  Interorbital Systems did, and sent me pictures.

I know, I know, you're thinking "aren't all the cool kids building their own rockets instead?"  Yeah-- and what are they gonna launch them off, huh?  Didn't think that far, huh?  So you're going to show up in a desert or tropical island somewhere with a rocket and be all "where shall I stick this?"  And the locals will be happy to tell you where to stick it.  Trust me, you need a launch rail for your rocket.  It's like the pod for the pea.