Yes i remember when i tried (for fun) to replace bootleg by worldcup map. Worlcup is bigger than bootleg so i couldnt go everywhere and reached the limit real quick.
Overestimating shouldnt cause any problem in my opinion. that's why i used map 70 svmap and created a map 71/72 off it. However anytime i tried to move to these zones using my korean client i got a map load error. my map.ini was correctly edited though.
There is obviously something more than just a map size problem.
Edit: i'll try to remove all portals/mobs/npcs from the 71/72 svmaps made of map 70 and see what happens.
Re-Edit: After removing the npc, mobs etc etc from the map i managed to no longer have the map load error, however im in a completely black environment, Bad respawn i guess. I'll check it out, got to go for a bit now.
Re-re edit, : i got the dungeon to work

i'll post my clean svmap in 1 hour, it could be used as a base.

(Can be used for 71/72/73)
Uploaded with
Next step is idendifying all the required files in the korean client to import this data in a US client. We are then ready for a public realease basically with clean ready to be edited svmaps.