Great mod, finally someone is giving infantry and forts their due respect (been waiting for this since CIV II )
i hope u can improve sevomod in these 2 aspects the following way:
I- be able to build MAP defences like the great wall of China and Hadrian wall
A- Ancient Era:
all we need to do is build a series of "wall" improvements with good "graphics" next to each other and make movement on them similar to road, unit healing is slightly faster, and make additional upgraded fortification improvements such as Moats that would act as rivers in terms of defence/attack scenarios etc....
But, attacking from behind ure own walls with infantry should have a penalty, and PLEASE reuse the Archer Ranged ability that was in CIV III.
B- Modern fortifications:
i.e. Siegfried line, Barleff, Magino, 37o line in Korea: a series of forts, pilboxes, bunkers, hospitals, underground tunnels, military airports, Radars.
it can heal soldiers a bit slower than cities, planes can land and take off in military ariports eliminating this way the need to overcrowd the map with uneccessary cities near the borders, Radars reveal 3 or 4 squares ahead and give advantage to air defences, units travelling on underground tunnels are not affected by standard airstrikes, lay mines.
by this, we open new opportunities for new units:
water Buoy, Minesweepers, Military engineers, Cruise missiles, Transport Planes, siege towers(why no one ever created a siege tower unit for Civ

) etc....
1-Water Buoy: layed by special planes or destroyers, last for a few turns, detects subs.
2-minesweepers: no need to explain
Military Engineers: expensive to build, just like settlers but, they can Sapp fortifications, build forts, towers, outposts and all military tile improvements.
3-Siege Towers: any unit using a siege tower while crossing a wall would not loose its turn.
PS: Distance between forts should be 3 or 4 squares but can be connected with walls, In addition, Cultural borders can be maintained using special buildings or the forts themselves because for god sakes, popping up cities next to the borders steals the fun from the game as it advances, and playing my favorite era (Modern Era) would not be so fun. let cities do what they do best, and forts do what they do best, no overlapping
II-Infantry role:
1-Infantry have increased defence bonus especially vs armor units, in Cottages, Hamlets and Towns not just cities in an increased manner.
2-Infantry and guns are the only units that can garrison fortifications described in part "
I".
3-PARATROOOOOPPPSSSS. who thought it was a good idea to eliminate those.
Thanks in Advance
Keep up the great work guys!