Create and update documentation for the various components involved (plan9 resource sharing, iked, etc.)
site-to-site iked
road warrior vpns
openBGPd
pf (packet filter)
Determine where the necessary components will run (Physical servers, VPSes, added to existing servers or as separate ones, etc.)
Compile a list of teams/team members interested in joining first test network
Set up a testing ground to prototype, test, and refine the overall configuration
Document the server-side configuration (should be done concurrently with prototyping etc. above)
Refine client-side configuration and document it, starting with OpenBSD clients
Test and document client-side possibilities on other OSes and with other software (low priority)
Implement the server-side setup in production
Feel free to add or suggest additional items, add detail where you are capable, etc.