Let's see:
Chantries provide
- easy access to the other planes
- A site for easier (reduced paradox) magic
- A research lab.
- A research library.
- Nodes connected for a source of Quintessence
- Security Systems
- Magical Wards
- Guardians
- Flunkies.
- Communications, possibly transplanar
- Fortification
If you are going to proceed without using Book of the Chantry...
I'd suggest each dot be used to provide 2-3 dots in subcategories above, which get resolved much like similar backgrounds.
I would consider having them each get 3 tokens per dot, and each, one token at a time, puts one token on a component of their choice...
Book of the Chantry drives its construction based upon disadvantages paying for the advantages... for example, location inside a town is 10 points more to build with. Many are in the 5 to 10 point range.