[FrankTrollman]

Absolutely. Further, I would like different fort plans to cover different things at the different levels.

For example: if you spend out the points for "magical fortresses", your forts protect the magic sites with just a level one fort. Otherwise you need the level 2 or even level 3 fort to do that. Contrarywise, if you spend out the points for the "city walls" archetype, you get a big admin value even on the level 1 fort.

The basic no-frills set-up would be something like:

Watch Tower (low admin, covers your Lab and Temple)
Castle (medium admin, covers your Lab and Temple and Magic Sites)
Citadel (High Admin, covers your Lab and Temple and Magic Sites)

but other progressions should certainly exist (and cost points):

Warrior Monastery (low admin, IS your Temple, covers Lab)
Shiro (Medium Admin, IS your Temple, Covers Lab and Magic Sites)
Dark Citadel (Medium Admin, IS your Temple, Covers Lab and Magic Sites)

Fortified Estate (Medium Admin, Covers your Lab and Temple)
Walled City (High Admin, Covers your Lab, Temple, Population and Magic Sites)
Fortified City (Very High Admin, Covers your Lab, Temple, Population and Magic Sites)

Wizard Tower (Low Admin, Covers Lab, Temple, and Magic Sites)
Magic Castle (Medium Admin, Covers Lab, Temple, and Magic Sites)
Floating Fortress (Medium Admin, Covers Lab, Temple, and Magic Sites)

-Frank