meph - aha! i like the way you're thinking on this =) good call on the pattern chrome/pattern mithril, for example - hell, all those planned changes look spot-on. the one thing you might want to consider is a fireproof armor upgrade path, such that people do have options for fireproof armor if it seems like they need some fireproof squads or platoons! what do you think about this upgrade path:
- fireproof armor material progression: titanium, wolfram, hellwood, slademantine
that would yield a light-ish but not terribly strong (i think) fireproof armor, a heavy strong rarer-then-steel fireproof armor, a wood fireproof armor, and an ultimate fireproof armor whose exact properties i'm not sure of but are probably plenty badass =D
also, i note that the leathers are now a bit weird! scales should be generic, no? as it stands i see "drake scale" and "darter scale", which seem suspiciously similar to the "cow leather" this mod is trying to avoid by using "common leather", right...? should it just be "scale plate" instead? also, where does scale fit on the chitin -> leather -> tough hide non-metal armor/value progression? if scale was the heaviest/best one in that progression, i think it would make perfect sense! it should then be more expensive, make better armor, etc...
also, in the interest of making more materials have one-word names, you might want to rename "tough hide" just "hide - that way you could have chitin (5p) -> leather (10p) -> hide (30p) -> scale (50p?), for that material progression.
finally, i note that frill lizards still seem to have black backgrounds! i really love this mod but seeing some of the more interesting creatures (the ones you added) stick out like a sore thumb makes it feel less polished. it's the little things like that that people notice right away - the devil's in the details, man! =D
in general, though, awesome. i really like where this mod is at now, and where it's going. i'll continue to test it out and give feedback and suggestions. cheers!