Also shows options for the multi-stage (orbital?) Stigs.
The largest looks like it should be capable of orbital flights, if they can shave enough weight off the center stage and make incremental performance improvements elsewhere.
Just as likely, it's merely a power-point "what if" with an orbital system being something different (or further on the back-burner than this makes it look).http://www.parabolicarc.com/2012/07/26/armadillo-aerospace-gets-launch-license-for-reusable-stig-b/
The Stig-III doesn't appear to be orbital-capable (not enough stages or the right staging ratio for a pressure-fed to get orbital), more like a high-suborbital like a traditional multi-stage sounding rocket but serving also as a platform for testing staging techniques (something I don't think they've done before).