Guild Wars 2

Is it possible for a single account/player to create multiple discrete guilds with separate stashes, influence counters, etc. and so forth?

Yes. I have 2 personal guilds. Both with a 50 slot vault and separate sets of influence.
You can be a member of up to 5 different guilds at one time. If you are the sole member of a personal guild and leave it, it and it’s upgrades, influence and guild vault with items are gone forever.

Thanks for the info, AP. I was hoping it worked this way. I need spaaaaace!

Yeah personal guild banks are great. I have a few as well. I have a mule account I use as well to make sure I don’t accidentally leave a guild or what not. Provides me a way to make sure I don’t lose my shiniest stuff.