I made a couple small modifications (I moved your watermark to the bottom so it could be seen, and hid the wall layer since it was redundant with the floor layer, and added drop shadows.
I took a character to the zone, and while EQ2 was still running, sorted my EverQuest II\cache\ioplans directory by Date Accessed, and found that the most recently accessed file was exp03_rgn_greater_faydark+exp03_dun_crushbone_keep_epic02_boss.iop which means the map file for this zone should be named "map_exp03_dun_crushbone_keep_epic02_boss.dds".
Then I saved the map in DDS format, and also in JPG format for posting to this forum.
I then copied the DDS file to EQ2MAPimages/maps
Next I picked two points in the zone that are far apart diagonally and that I can get to, and record both the in game coordinates and the x/y coordinates of that location from inside Paint Shop, and plug them into Tacoman's ZoneRect tool.
I plugged the zone rect into a map entry in the EQ2MAP/eq2map/core_mapstyles.xml file which looks like this:
Ah, it must not be the D'Vinnian Throne I'm thinking of then... but I'm almost certain theres another zone that uses that map. I could be wrong though, hehe =)