<p>I feel like this might be a bad decision. Wouldn't it be a lot cleaner and simpler to have everything under a single navbox, rather than loads of almost-empty navboxes, some of which are all together on a single page? Also, since there's a lot of overlap between the fiefdoms (bricks, structures, etc.) most navboxes would, if not almost empty, be almost duplicates of one another.
Edit: Here is a very quick mockup of the idea:
</p>
<table style="clear:both; padding-top:5px; padding-bottom:10px;"><table style="text-align:center; width:100%;" class="toccolours"><tr><td style="background:#F9F9F9;" class="mw-customtoggle-faction-gondor">
<span style="color:#161616">The Men of Gondor</span> 
</td></tr><tr><td class="mw-collapsible mw-collapsed" id="mw-customcollapsible-faction-gondor">
<p>
<span class="nav_header">NPCs:</span>
Gondorian •
Levyman •
Soldier (
Archer,
Banner Bearer,
Tower Guard)
<span class="nav_header">Traders:</span>
Captain •
Market Traders<span class="nav_header">Items:</span>
Armour (
Horse) •
Bow •
Equipment<span class="nav_header">Blocks:</span>
Beacon •
Brick (
Cobble) •
Casket •
Crafting Table<span class="nav_header">Structures:</span>
Beacon Tower •
Fortress •
Obelisk •
Ruined Tower •
Ruins •
Settlements •
Turret •
Watchfort
</p>
<table style="width:100%;" class="toccolours"><tr><td style="background:#000; color:#E5E4E2;" class="mw-customtoggle-faction-mornan">
The Soldiers of the Blackroot Vale 
</td></tr><tr><td class="mw-collapsible mw-collapsed" id="mw-customcollapsible-faction-mornan">
<p>
<span class="nav_header">NPCs:</span>
Soldier (
Bowman)
<span class="nav_header">Traders:</span>
Bowlord<span class="nav_header">Items:</span>
Armour •
Bow<span class="nav_header">Blocks:</span>
Blackroot
</p>
</td></tr><tr><td style="background:#211EC3; color:#F6FAFD;" class="mw-customtoggle-faction-amroth">
The Knights of Dol Amroth 
</td></tr><tr><td class="mw-collapsible mw-collapsed" id="mw-customcollapsible-faction-amroth">
<p>
Man-at-arms (
Archer) •
Swan Knight (
Banner Bearer)
<span class="nav_header">Traders:</span>
Captain<span class="nav_header">Items:</span>
Armour (
Horse) •
Equipment •
Swan Feather<span class="nav_header">Blocks:</span>
Brick •
Crafting Table<span class="nav_header">Structures:</span>
Stable
</p>
</td></tr><tr><td style="background:#254117; color:#D1D0CE;" class="mw-customtoggle-faction-ithilien">
The Rangers of Ithilien 
</td></tr><tr><td class="mw-collapsible mw-collapsed" id="mw-customcollapsible-faction-ithilien">
<p>
<span class="nav_header">NPCs:</span>
Ranger of Ithilien<span class="nav_header">Traders:</span>
Captain<span class="nav_header">Items:</span>
Armour<span class="nav_header">Structures:</span>
Hideout
</p>
</td></tr><tr><td style="background:#052636; color:#e0e0e0;" class="mw-customtoggle-faction-lamedon">
The Hillmen of Lamedon 
</td></tr><tr><td class="mw-collapsible mw-collapsed" id="mw-customcollapsible-faction-lamedon">
<p>
<span class="nav_header">NPCs:</span>
Warrior (
Archer,
Hillman)
<span class="nav_header">Traders:</span>
Captain<span class="nav_header">Items:</span>
Armour •
Gambeson
</p>
</td></tr><tr><td style="background:#0973a8; color:#e1e1e1;" class="mw-customtoggle-faction-lebennin">
The Folk of Lebennin 
</td></tr><tr><td class="mw-collapsible mw-collapsed" id="mw-customcollapsible-faction-lebennin">
<p>
<span class="nav_header">NPCs:</span>
Levyman<span class="nav_header">Traders:</span>
Captain<span class="nav_header">Items:</span>
Gambeson
</p>
</td></tr><tr><td style="background:#F7F7F7; color:#d51212;" class="mw-customtoggle-faction-arnach">
The Mountaineers of Lossarnach 
</td></tr><tr><td class="mw-collapsible mw-collapsed" id="mw-customcollapsible-faction-arnach">
<p>
<span class="nav_header">NPCs:</span>
Axeman<span class="nav_header">Traders:</span>
Captain<span class="nav_header">Items:</span>
Armour •
Equipment
</p>
</td></tr><tr><td style="background:#2EA3A4; color:#F0FFFF;" class="mw-customtoggle-faction-pelargir">
The Mariners of Pelargir 
</td></tr><tr><td class="mw-collapsible mw-collapsed" id="mw-customcollapsible-faction-pelargir">
<p>
<span class="nav_header">NPCs:</span>
Marine<span class="nav_header">Traders:</span>
Commander<span class="nav_header">Items:</span>
Armour •
Equipment
</p>
</td></tr><tr><td style="background:#347C17; color:#FCFCFC;" class="mw-customtoggle-faction-pinnath">
The Warriors of Pinnath Gelin 
</td></tr><tr><td class="mw-collapsible mw-collapsed" id="mw-customcollapsible-faction-pinnath">
<p>
<span class="nav_header">NPCs:</span>
Soldier<span class="nav_header">Traders:</span>
Captain<span class="nav_header">Items:</span>
Armour
</p>
</td></tr></table></td></tr></table><tr><td></td></tr></table><p>
It's bigger than the other faction navboxes, but not that much bigger. Also, lots of that could probably be shortened in ways such as
</p><p>Armour (Pelargir | Lossarnach | Pinnath Gelin...) Captain (Lebennin | Lossarnach | Lamedon...)
</p><p>. And the Biomes navbox is around this size too.
</p><p>Well, anyway, it's up to you.
</p><p><i>Edit: changed link ~Milk</i>
</p>