First off, was the estates system never finished or am I doing something wrong?
As far as I can remember it hasn't been finished... and Crat re-used some of the estate handlers for the BUILDER group, so probably whatever was half-done originally is even more broken now. Builders are players that can use QCS to create areas and items that are "useless" (weaps with 0 dam, monsters that can't kill you, and so on), but not code. Meant for stuff like a player to design an area to contribute, or such, I think. Or, possibly, for furnishing their own area/estate, once that works.
Now for the next thing: High Mortal. I've never heard o it, can anyone explain it to me and how I can become one?
"A player (not creator) that's lv25 or more". Look in /secure/sefun/pointers.c for high_mortalp().
And the third thing: I3. In the arch room, it says I3 is not connected, and IMC2 is waiting for acceptance. If I go to the router room and try to manipulate these, is cliams their daemons aren't online.
IIRC to get on the intermud you need to give your mud a name different than the default Dead_Souls_yourname thing. Also, if you have a firewall, or are on a filtered connection like college/corporate network, it may be blocking _outbound_ connection from your mud to alcatraz.wolfpaw.net (204.209.44.3) port 8080.
Also, go to the network room below the arch room, issue "update /daemon/intermud" command, and look for clues in the output.
Good luck!
PS. Ugh, ninja'd!