This is my vision of a CWCS (Component Wall Castle System)
applied to the Great Wall of China which I then call the
Great Wall Component System (GWCS).   The term CWCS was 
coined by Richard Schamus who has done a lot of CWCS for
Euro castles on his web page.

The GWCS I have pictured are
01_str    - great wall straight
02_cur      - great wall curved piece
03_Scur     - great wall "S" curved piece
04_curtwr   - great wall curved w tower
05_curtwrsl - great wall curved on slope
06_Llge     - great wall "L" shape large
07_Lsml     - great wall "L" shape small
08_slstr    - great wall straight slope
09_slcur    - great wall curved slope
10_mntwr    - great wall mountain beacon tower
11_destwr   - great wall desert tower
12_despc    - great wall desert piece
jadegate    - great wall Jade Gate Fort (which is based on the
              real fort located in the Gobi desert.)

Of course many other GWCS can be constructed
Ttwr   - great wall t-piece w tower
twrend - great wall tower end piece
Jcur   - great wall curved j piece

Note the pieces are constructed on standard green baseplate
or the standard gray baseplate (gwfort)

For the green baseplate I use the following stud spacing:
8 studs - spacing from edge
3 studs - dk gray corner 3x3x6 or dk gray brick
2 studs - 1x2 brick with hole in center
2 studs - spacing
2 studs - 2x2 brick with pin in center
3 studs - dk gray corner 3x3x6 or dk gray brick
12 studs - spacing from edge
(see the std_end.jpg for the spacing I used)

This way a GWCS component can be rotated 180 degrees and still
fit but the green base plates will be offset by 4.
The goal is to build a bunch of different GWCS then string
them all together for a interesting looking Great Wall of China
segment.