No disrespect to @Bluebird, but we dont need him.
All that is needed is for a bunch of you with suitably capable bandwidth to agree to do it, decide which client and vault software we are using, agree a network name and share some seed IPs to generate a vault.config file.
Then nominate one person to fire up their vault with the -first flag (or was it -seed?) Its in the docs anyway. Ten the first few of you join in. But not all at once....
It wont be me and I wont be playing cos I am totally snowed under with the Real Job. I'd love to get tore in but realistically, its not going to happen.
Have fun and all the best.
We did this before, Im sure you can manage it again.