I've completed the Jenkins build script, after some more tweaking and testing, and it's working fine. I've updated the wiki page about it, and GN has put in a request for a new VM we can build up to replace the old one. Learned quite a lot in the process of doing this. The horrible curl request in the previous post actually works, if you do it at the right time (after downloading all the jobs, setting them up, and restarting Jenkins so it knows the jobs are there).