On Facilities
I don't like the Armory. It's a high cost facility that provides almost no benefit. In the event of an attack, you go from an expected loss of 1.0 defenders to a loss of 0.75 defenders, and have to pay again to have those same benefits in the next attack. It's not worth it in terms of benefits, or in terms of space used.
Instead, I'd integrate it into the Barracks themselves. Something like:
Level 5: As in UA, you can recruit up to 12 guards
Level 9: You've improved the armory for the guards. Roll d8's during an Attack instead of d6's.
Level 13: You can recruit up to 20 guards, as well as a lieutenant commander who reduces the number of dice rolled by 1 during an attack. (size: Vast)
Level 17: You can recruit up to 30 guards, as well as a second lieutenant commander.
Should probably have some benefit other than just guarding during an Attack. Maybe get a +1d4 on any negotiations performed in your Bastion, given the security and authority being displayed?
General tiering ideas
Level progression for all facilities: 5 > 9 > 13 > 17
Higher tier provides more benefits, and is generally larger in size. When combining different facilities from the UA document, lower tier benefits should still be available when upgraded to higher tier facilities.
Generally must buy at the entry level (usually level 5), and then upgrade from there. Limits on how often an upgrade can be done?
Reaching level 17 may allow combining two tiered facilities into a single facility with combined benefits (though the BP return only goes up one die size), giving you room to build another facility. You need to have both base facilities at level 13 to combine them into the level 17 version. These combinations are limited and enumerated.
Pub:
Pub (Cramped) > Bar (Roomy) > Tavern (UA Pub) > Cantina (Vast; combine with Theater)
Leveling benefits: Improved information network; improved magic potions.
Gaming Hall:
Back Room (Cramped; dice games) > Gambling Den (Roomy) > Gaming Hall (Vast) > Casino (Vast; combine with Tavern or Theater)
Theater:
Stage > Playhouse > Theater
Leveling benefits: Incraesed Theater Die size. Reputation and renown.
Library:
Combine Library, Scriptorium, and Archive
Library > Scriptorium > Archive
Garden:
Combine Garden with Greenhouse.
Garden (Roomy) > Greenhouse (Roomy) > Grove (Vast)
Stable:
Combine Stable with Menagerie. Put Stable at level 5.
Stable (Roomy) > Nursury (Roomy) > Menagerie (Vast)
Leveling benefits: Be able to house and take care of more complex and exotic animals and mounts.
Planar:
Combine planar-related facilities.
Teleportation Circle [level 9] > Observatory > Demiplane
Storehouse:
Rename to "Shop". Can be any type of mundane trade. Higher level = increased profits.