Im wondering if you would be open to changing the defensive system... if not disreguard this post

personally I think defense has been neglected in civ.. and should have more benifit. this is just a proposed idea, none of the numbers are set in stone... and if anyone else has ideas for buildings and balance they are welcome to...
I think as it stands there are only a few buildings that add defense, and the rest is based on city population... so a large city with walls and a citadel would yeild the highest defense bonus which can be completely torn down with enough seige weapons.
So Im proposing a change to this system...
1. No longer does population add defense percentage... its all based on buildings
2. more buildings are made available to raise defense
3. defensive trait leaders can build defensive buildings and forts in half the time.
4. defensive buildings are not destroyed when a city is captured
Changes =
cities = 10% defense and doesn't change due to bombard
palasade = +10% defense bombards to 0
walls = +40% defense bombards to 0
Portcullis = +5% defense damages attackers 10%
Machicolation = damages attackers 10%
Barbicon = +10% defense, damages attackers 5% and archers get +1 distance to ranged attack
Concentric castle = +20% bombards to 15%
Citadel = same as in orbi bombards to 10%
total defense = 115% and bombards to 35% with concentric castle and Citadel.
Moat and drawbridge = crossing river penalty to attacking units - no penalty for attacking defender units
Postern = +1 first strike to attacking defender units +30% withdrawl chance
Balista towers = gives 3 free ranged siege attack.
possible wonders could be made for more defense ... for example the great wall adding 10% defense on all cultural tiles..
- it would be nice to take away buildings being destroyed when a city is taken and change it to bombardment having a chance to destroy city buildings
-unrelated ideas... other modmodders have changed it so vampires could feast a city to 0 and raze it. I like this idea and think it would be good in orbi. I also think the vampire and werewolf promotions could be given for dungeon exploring. - and raise the werewolf hero's chances of producing werewolves.
I like the extra explorable animal dens... cant wait to try it.