What would be nice would be a build up advancement.
Pick up to a certain type of Fortress and a build string. Every turn you have the option to either continue building (up to your 'cap') or hold and remain on a lower Version. This would also incrementalize the cost of building.
Like this:
code:
Wizard Tower Citadel
| /
| Dark Citadel - Mountain Citadel
| /
Watch Tower - Mausoleum
\
Fortress - Hill Fortress
|\
| Castle
Fortified City
Or something similiar, the stats would have to be adjusted and costs, but if each level cost say for example: 150 Each (And lower the Watch tower to 0 Admin, 25 Defense to represent it) then you could have a sort of build string while maintaining the difference in cost. It still doesn't change the IMO screwy Dpoint cost of some of the Fortresses.
[ March 16, 2004, 07:36: Message edited by: Zen ]