Great ideas! Once I read it, I couldn't stop thinking about the possibilities, so I blame you for this, Nharil.
Structures:
Every LS house starts with a main hall, your basic of basic structures. Guild leader selects the main hall from a list of options of varying materials and architecture types. Then, once the main hall has been built, more options become available.
For the DoH:
- Kitchen
- Forge (Covers both Blacksmith and Armorers)
- Woodshop
- Gemmary
- Leather Workshop
- Alchemy Workshop
Building these will grant LS members access to common crafting support. Each can be upgraded twice, each upgrade allowing for additional support. Namely, Guild and Master.
For the DoL:
- Garden
- Pond/Aquarium
- Archaeology
I first saw a Pond/Aquarium and Archaeology being suggested
here by Lienn and I just thought they were wonderful ideas. Fishers cultivate and catch rare fish, Miners could search for and discover lost relics (that hold some level of importance, from activating LS wide quests or just for selling to fill the LS coffers), and Botanist tend the gardens, harvesting rare and useful materials.
Other Structures:
- LS Safe/Bank - (Upgradeable to hold more items)
- Trophy Room - Visual representation of achievements the LS has earned together
- Chocobo Stables
- Locker Room - (Private storage for Individual LS members)
- Second Floor
- Basement
And the most important structures...:
- Boat Dock
- Boat
- Airship Dock
- Airship
That doesn't even cover all the armaments and other decided needed to build a sturdy, durable, offensively powerful boat or airship.
Maybe some LS currency for work rendered in the name of the LS to be used to purchase items and gears in the bank?