I have modified the No-Walls mod that is used on other servers so it will be compatible with this server. All I have done is changed the offset of the frames so they would go hand in hand with AoP. This was a simply straightforward operation. The link to download the mod is here:
http://uralez.de/foaop/walls_aop.zip
If you need any further help, there is a readme inside the zip that explains everything.
In doubt, feel free to write.
The game will look like that though, so you might want to consider not putting it in if you care about aesthetics:
(http://uralez.de/foaop/walls_aop.png)