As Tavish mentioned in post #108, he based it on my plugin (the one the thread is about, and of which there are around 40 screenshots).
Your mud appears to use a modified version of the generic plugin I released to coincide with my protocol snippet. Did you add the snippet to your mud as well? If so, it should be relatively easy to extend it to send data about mobs - look at the way it handles spell affects and do something similar.
1) I can't use your snippet because I use Java as programming language. But I'm not too worried about sending/parsing data, I just don't think it's so easy to create windows, hotspots, etc.
2) I'm stuck with Telnet protocols but perhaps you can help me. I see that (for example) IAC WILL MSSP represents bytes or characters, 255 251 70, I tried sending (char)255 + (char)251 + (char)70 and other things but nothing works (no response from the client). I successfully implemented MXP but not the "handshake" to activate it. I activate it from CTRL + ALT + U.
Hotspots are easy to add, but if you want to see how I did it you can download the latest version of my plugin from here: http://www.godwars2.org/plugins
It looks like this: http://godwars2.blogspot.com/2012/11/mushclient-gui-18-nov-2012.html - lots of hotspots for buttons, icons, maps, etc.
For the protocol stuff, you might want to download CoffeeMUD and see how they handle it - I believe it doesn't handle the MXP handshake either, but it supports MCCP and that must be negotiated.
Glad you found my plugin useful, however your in-band solution will have a drawback if you decide to add the health bars beneath the avatars as well - you'll only see the bars refill when new text is displayed on the screen. If you're sitting around and waiting for your party to heal before moving on, you'll have to keep hitting enter.