I don't want to spoil the broth with more variations and details, but I am intrigued by the implications of the Manshonyagger's self-repair systems.  The analogy with a tree is very.... hmm, what's the word?  Provocative? Fascinating?  They would have a gnarled, twisted appearance, the friction of the ages would have smoothed their rough planes.  In addition to simple self-design and self-modification, they would have practiced a form of self-topiary...

Wikipedia has some images of bristlecone pines that would suggest the resulting look perhaps.

http://en.wikipedia.org/wiki/Bristlecone_pine

Geekery: Aldiss' Helliconia trilogy has animal-plant creatures called stungebags...

The attached image is of a typical pine, which I could imagine as an old m'yagger, like a dragon having slept for a millennium underground emerging once more to survey its domain.


From: pinlighter@btconnect.com
To: bidavids@hotmail.com; eira.sms@virgin.net; pinlighter@btconnect.com
Subject: Re: Night land : Sea of images: Section 3.
Date: Wed, 9 Feb 2011 15:59:47 +0000

ARMOUR and MANSHONYAGGERS

A few points
 
 
** the most beautiful machines human beings make are war machines.   This is comprehensible because war machines, like living things, are undergoing intense real-world selection and the unfunctional unbeautiful gets flensed away according to criteria which are absolute and objective.
The most beautiful war machines approach the grace of a living thing. 
 
** the most beautiful of an evolving line of machines are the last ones built before the machine type becomes obsolete under the impact of a quantum leap of new technology.  Battleships like the Scharnhorst or the New Jersey were built just before big-gun warship was pushed aside by the aircraft carrier, for example. Contemporary fighting arcraft are about to be pushed aside by drones, but they have achieved real beauty too.
 
** this applies to armour.  (Armour is a machine for the purposes of this discussion).  Perhaps the most beautiful ((and therefore most functional, if the equation I'm drawing is correct)  form it took was the Gothic, which unsurprisingly looks not unlike a Centurion. A little after this peak it was rendered pointless by gunnery and became ceremonial - and it's at this time that the parade armour becomes popular.  ((Which rather undercuts Brett's referent to Negroli, because he was working in an era of armour's decadence, while in the Night Land the armour is still vitally functional and undergoing cutting-edge evolutionary selection by the forces of the Land.   This is not to say that the point of armour as decorated, or as an expression of clan and personal status, is wrong, because it isn't, but there is a difference here which must be appreciated.  The Negroli forms are over-ornate to a nonfunctional degree.   But decoration and badges of status and affiliation were used on armour at all times.  They tended however to be separate from the armour - surcoats, crests, etc.   Well, Brett has actually said all this already, hasn't he???))
 
** however we are now at the end of time looking backward to the past and there are no more leaps in tech.   Armour has become perfected to a level never seen in our history, and looks as graceful as a living thing.   How to draw this?  Well, in the absence of any other option I'd draw on the coolest Gothic suits I could find on the web and make them a little smoother and at once more organic and more high-tech - chaos-death-spikybits seem intrinsic to the Gothic forms but are probably counterindicated in the Night Land.  
 
This last advice is very detailed, probably going beyond useful levels, because too exact & particular, and I emphasise please,treat it as just my feelings at this time, definitely not prescriptive
 
 
 
 
MANSHONYAGGER.  The same grace-beauty-deadliness equation applies.
 
And a little voice at the back of my head says "fractals."   Fractal forms seem intrinsic to entities that self-repair and self-construct as opposed to being manufactured.   The manshonyagger's scars, repaired, might bloom into a life-like clustering of units and sub-units much as a tree's scars put forth branches and the branches twigs. 
 
But there will be a functional tension between this working and tis exploding into self-repair-cancer (future societies will have a short instantly-understood word for the cancerous proliferation that results from control failure in self-healing autonymous systems).   OTOH it's the m. that have the capacity to self-mutate who will have become autonymous survivors and "players", therefore they will come from the grotesque end of this spectrum. 
 
 
 
In haste, more may follow