From Lich's log-dump:
<dialogData id='combat'><dropDownBox id='dDBTarget' value="none" cmd="target %dDBTarget%" tooltip='Select Target' content_text="none,silver grey mouse" content_value="target help,#12235271" anchor_left='cmdTarget' anchor_right='cmdAttack' height='20' width='80' top='93' left='0' align='n'/></dialogData>^M
<streamWindow id="main" title="Story" location="center" target="drop" resident="true"/><streamWindow id='main' title='Story' subtitle=" - Moonglae Inn, Atrium" location='center' target='drop'/><streamWindow id='room' title='Room' subtitle=" - Moonglae Inn, Atrium" location='center' target='drop' ifClosed='' resident='true'/><clearStream id='room'/><pushStream id='room'/><compDef id='room desc'>A skylight two stories above allows natural light to flood this room, giving it the feel of an outdoor cafe. Set into the grey marble pillars surrounding the atrium are metal planters filled with a variety of flowers, plants, and hanging vines. A <a exist="-44192" noun="fountain">burbling fountain</a> in the center of the room makes the illusion complete. Overhead, a row of black granite pillars surrounds the upper cloister, with a gallery of stained glass windows hanging between them.</compDef><compDef id='room objs'> You also see<b> <pushBold/>a <a exist="12235271" noun="mouse">tiny silver grey mouse</a><popBold/></b> and a variety of <a exist="96219" noun="tables">tables</a> spaced throughout the room.</compDef>^M
<compDef id='room players'></compDef>^M
<compDef id='room exits'>Obvious exits: <d>north</d>, <d>northeast</d>, <d>east</d>, <d>southeast</d>, <d>south</d>, <d>southwest</d>, <d>west</d>, <d>northwest</d></compDef>^M
<compDef id='sprite'></compDef><popStream id='room'/>^M
<streamWindow id='inv' title='My Inventory' target='wear' ifClosed='' resident='true'/><clearStream id='inv' ifClosed=''/><pushStream id='inv'/>Your worn items are:^M
a <a exist="12235199" noun="pouch">rune-stitched black silk gem pouch</a>^M
a <a exist="12235198" noun="ring">narrow gold ring</a>^M
a <a exist="12235197" noun="tattoo">cracked black heart tattoo</a>^M
a <a exist="12235185" noun="cloak">jet black spidersilk cloak edged with silver silk trim</a>^M
a <a exist="12235184" noun="wristchain">simple silver wristchain</a>^M
a <a exist="12235181" noun="shirt">black silk shirt with silver-buttoned cuffs</a>^M
<a exist="12235180" noun="gloves">some soft black leather gloves</a>^M
a <a exist="12235168" noun="chain">blackened mithglin chain</a>^M
a <a exist="12235155" noun="sash">black silk sash</a>^M
a <a exist="12235154" noun="trousers">pair of black silk trousers</a>^M
<a exist="12235153" noun="boots">some cuffed black leather boots</a>^M
a <a exist="12235111" noun="jacket">pitch black jacket</a>^M
a <a exist="12235110" noun="barrier">swirling sonic barrier</a>^M
<popStream/>^M
<exposeContainer id='stow'/><container id='stow' title="My Cloak" target='#12235185' location='right' save='' resident='true'/><clearContainer id="stow"/><inv id='stow'>In the <a exist="12235185" noun="cloak">cloak</a>:</inv><inv id='stow'> a <a exist="12235196" noun="opal">black opal</a></inv><inv id='stow'> a <a exist="12235195" noun="statue">small statue</a></inv><inv id='stow'> a <a exist="12235194" noun="potion">rose-marrow potion</a></inv><inv id='stow'> a <a exist="12235193" noun="crystal">blue crystal</a></inv><inv id='stow'> a <a exist="12235191" noun="orb">heavy quartz orb</a></inv><inv id='stow'> a <a exist="12235190" noun="falchion">feras falchion</a></inv><inv id='stow'> a <a exist="12235189" noun="scroll">smeared scroll</a></inv><inv id='stow'> a <a exist="12235188" noun="naginata">naginata</a></inv><inv id='stow'> a <a exist="12235187" noun="statue">small statue</a></inv><inv id='stow'> a <a exist="12235186" noun="statue">small statue</a></inv><openDialog type='dynamic' id='combat' title='Combat' location='right' target='combat' height='213' resident='true'><dialogData id='combat' clear='t'><image id='unsheathe' name='SwordBtn' cmd='_ready weapon' tooltip='Unsheathe Weapon' echo='ready weapon' align='n' top='3' left='-50' height='29' width='29'/><image id='readyshield' name='ShieldBtn' cmd='_ready shield' tooltip='Ready Shield' echo='ready shield' anchor_left='unsheathe' left='3' height='29' width='29'/><image id='sheathe' name='NoSwordBtn' cmd='_store weapon' tooltip='Sheathe Weapon' left='8' echo='store weapon' anchor_left='readyshield' height='29' width='29'/><image id='storeshield' name='NoShieldBtn' cmd='_store shield' tooltip='Store Shield' echo='store shield' anchor_left='sheathe' left='3' height='29' width='29'/><link id='lnConfigure' value='configure' cmd="_cmbtpl configure dialog" top='30' align='n' left='0' echo='configure'/></dialogData></openDialog>^M
<dialogData id='combat'><progressBar id='pbarStance' value='100' text='defensive (100%)' top='51' width='130' height='16' left='0' align='n' tooltip='Percent of stance contributing to defense'/></dialogData>
Lich will let you do whatever you want to the XML stream. As will Black Lightning, to my knowledge. I believe that BL plug-ins have to be written in C# and have to be in whatever Microsoft's version of "bytecode" is (pseudo-compiled), but don't quote me on it. Because of that, a BL plug-in would be faster than Lich interpreting a script from text (though it doesn't really matter unless you're doing substantial text scanning/substitution; chances are you won't even be able to see a difference).
Now, how you accomplish what you want is another matter altogether. But any of the fields you see defined in that snippet, you could technically re-define as you please. Or, if you're really industrious, yes -- you could make up your own windows with their own gauges.
Oh yeah, ignore the "^M" at the end of the lines... that's just a carriage-return (long story).