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« on: June 17, 2009, 09:33:04 am »
Suggested catwalks plans for the outer walls (view from the side):
=_ ~ _= <- Level Z+1
# ~ # <- Level Z+0
###~#### ~ ####~### <- Level Z-1
######## ~ ######## <- Level Z-2
A two-level-high wall, with second floor turned into fortifications and a catwalk along the inner perimeter.
There should be no staircases from the catwalk to the inner yard (any staircases built during construction should be removed). When completed, the catwalk should only be accessible from the tower through the bridges.
Tower will have 1-tile-wide bridges in all 4 directions on the second level.
Supposed plans for level Z+1 (basic):
#######################
#++++++++++<++++++++++#
#+ + +#
#+ + +#
#+ + +#
#+ + +#
#+ + +#
#+ ##+## +#
#+ #+++# +#
#+ ###+++### +#
#+ #+++++++# +#
#<+++++++++X+++++++++<#
#+ #+++++++# +#
#+ ###+++### +#
#+ #+++# +#
#+ ##+## +#
#+ + +#
#+ + +#
#+ + +#
#+ + +#
#+ + +#
#++++++++++<++++++++++#
#######################
Note the up staircases on the catwalk - they will be necessary once the third level of defences will be complete, at this stage they can be replaced with regular floors. All outer walls on this second level are obviously fortifications.
For further development it is suggested to build inner walls as well, both for causeways and the perimeter catwalk, making them fortifications as well. This way, marksdwarves will be able to control the inner courtyard while being protected by fortifications from enemy fire (if any).
Supposed plans for level Z+1 (after extra fortifications are complete):
#######################
#++++++++++<++++++++++#
#+#########+#########+#
#+# #+# #+#
#+# #+# #+#
#+# #+# #+#
#+# #+# #+#
#+# ##+## #+#
#+# #+++# #+#
#+# ###+++### #+#
#+######+++++++######+#
#<+++++++++X+++++++++<#
#+######+++++++######+#
#+# ###+++### #+#
#+# #+++# #+#
#+# ##+## #+#
#+# #+# #+#
#+# #+# #+#
#+# #+# #+#
#+# #+# #+#
#+#########+#########+#
#++++++++++<++++++++++#
#######################
Next step for development includes building walled causeways on the third level as well. However the walls for the 3rd level causeways must remain solid walls. When this is done, 2nd level causeways (with fortifications) should be marked as Low Traffic. This will result in all traffic from the tower to the outside fortifications going through the fully protected 3rd level causeways, while marksdwarves may still be positioned on the 2nd level causeways when necessary.
Note that it is not necessary to build entire outer fortification wall on the 3rd layer - a protected staircase down to the battlements on each side should be enough.
Supposed plans for level Z+2:
++++++++++###++++++++++
+ #># +
+ ++++++++#+#++++++++ +
+ + #+# + +
+ + #+# + +
+ + #+# + +
+ + #+# + +
+ + ##+## + +
+ + #+++# + +
+ + ###+++### + +
########+++++++########
#>+++++++++X+++++++++>#
########+++++++########
+ + ###+++### + +
+ + #+++# + +
+ + ##+## + +
+ + #+# + +
+ + #+# + +
+ + #+# + +
+ + #+# + +
+ ++++++++#+#++++++++ +
+ #># +
++++++++++###++++++++++
Also note that I scaled down the entire structure, including the inner tower, for easier understanding.