hi there!
i'm probably not the best to answer this, but it looks like i am the first. [img]smile.gif[/img]
i recently had this problem with an arch wallset that i had made...from two steps back, it would appear as if there were three arches next to each other, instead of just the one that i had placed (ala your diagram).
this is just the way that dungeon craft shows the walls. i don't know if richard can fix this, or if it's something that can be addressed in a configuration file.
i take it that you've been to the main dungeon craft page and to ironworks; but i thought i'd mention the addresses of some other sites with walls.
my site is
http://www.geocities.com/manikus5/dc/index.html
joerg weber has some at
http://www.dreamlands.de/ua-frame.htm
jeremy dore at
http://members.optusnet.com.au/~jeremy77/index.html
lord killjoy at
http://lordkilljoy.topcities.com/
and the magic mirror in the dungeon craft (dc) section
http://www.frua.dns2go.com/ (there are some really good star wars walls here [img]smile.gif[/img] )
hope this helps.
[img]graemlins/mage1.gif[/img]