It is still open, but Ulth has pretty much limited it to one non-Monster Girl character. And he's restricted the sole male character to being a completely mundane one who will get toyed around with by the Monster Girls, rather than successfully hunting them. ^^;
If you'd like, you could try and create a competing character to Zaer's traveling aristocrat, though. It's not first-come-first-serve, so you still have a shot at the position.
Edit: Ah, and you presumably start out with full wealth-by-level for a 14th-level character.
Yeah, 30'ft x 30'ft but with GM's approval the cube turns into more than one floor admantine fortress (a posh quality one). Small and comfy place.
Ah. Well, last night I spent some time tinkering around with the Stronghold Builder's Guide, and it actually does say in the rules that you can build a Stronghold around a Daern's Instant Fortress. The Landlord feat gives you 200,000 gp at this level to spend on your Stronghold, and provides extra funds matching any of your own money that you spend on the Stronghold, so because you spent 55,000 gp on that Instant Fortress, you'd get 255,000 gp for your magnificent mansion.
The basic build I made trades in the adamantine walls for wooden ones, but in turn you get things like full climate control, an Unseen Servant in every room, infinite water for the baths in the spa, an infinitely-stocked larder for the kitchen, 6 spare bedrooms for guests, a dining hall that seats 30 and has magical tables that cast Purify Food and Drink on each meal served on them... And all of it can be shrunk up and put in your pocket at a moment's notice, thanks to being built into a Daern's Instant Fortress.