It should be possible to start a new network. I actually just did and made a topic about it. But due to problems with my IP and port forwarding it couldn’t be done 
. But here’s a way it should work:
Before you do, make sure to edit the safevault.crust and to pick a name for the network.
Do the same with the SAFElauncher.crust
use your terminal to start a Vault using > safe_vault - f
the f means first and it let you start a network as a seed-node.
Add your IP to the hard coded contact list in both the safevault.crust and SAFElauncher.crust and share the details with the community. port 5483 on your modem should be forwarded to the computer or VM running the vault.
I guess that should work.