Ahem, having watched this debate go on for some time, I thought I might chime in.
Archives of the weekly news reports (but alas not the daily ones) is listed on:http://web.archive.org/web/199911030500 ... chive.html
I did play on the old Cavedog Boneyards service during these Galactic Wars and in the latter stages actually was a Newsbot (i.e. I wrote some of those daily news reports). The writers were player volunteers, but given an official "Newsbot" account by Cavedog in order to actually post the news, so I suppose that is as official as it gets as Cavedog owned the IP.
In terms of canon, there really isn't much as there isn't much story aside from the manual, and then the Galactic War news reports.
One critical thing however to note is that the chronology of the Galactic Wars actually takes place after the main game and expansion set, as there are units that did not appear until the expansion there. It means that somehow both sides have been able to rebuild their populations somewhat despite the apparent defeat of the Core (and second subsequent defeat in the Galactic War initial stages as Core bounced back to defeat the Arm).
There are almost no hard numbers to go with and the use of gigatons certainly sounds hyperbolic given the behavior of the plasma shells in Week 14 news report:
The walls of Glynholm castle blistered and cracked under the force of the Core siege machines. Smoke poured out the windows of the northeast wing, flames licking at the ancient stone, stood for generations, like the orange tongue of serpents of old.
Plasma shells rained down from afar, thudding against the hardened walls, shaving them away in showers of gray dust. A mighty Krogoth Kbot burst through the west wall with a kick of unimaginable force to those who had originally constructed this fortress.
What is referred by "weak cloaking" is actually mentioned in the game manual:
Rocket: This is a generic name for a wide variety of weapon systems. Generally they have a preprogrammed flight path to prevent an unsophisticated guidance package from being completely fooled by the ordinary "weak cloaking" and electronic spoofing that all units possess. They carry a larger payload than a smarter missile and this payload is almost invariably a small amount of antimatter.
In other words, all TA game units had some low level of ECM. The cloaking as referred to for all practical purposes by game players was that energy consuming option used by Commander units that would make it invisible even to visual optics.
As for the whole "metal" issue, from the game manual:
Nano-bots are made of metal. While non-metallic elements used to build the nano-bots are used in quantity, the rare elements which limit production are a variety of heavy metals, so the raw material need to build nano-bots has come to be known generically as "metal".
Ore: This is an economic term. If a mineral deposit worth developing it is considered ore. An ore body is a good place for a metal extractor, and looks like a rough section of shiny rocks. The more shiny rocks visible, the better the ore body.
Metal extractors could be placed elsewhere other than an ore deposit and would still produce some minimal income, but that can be explained as extraction of trace amounts. The explanation of use of non-metallic elements used to build the nano-bots explains as well how some units are primarily "energy" in game costs, such as the aircraft. They were using lots of non-metallic composites or other materials compared to the hulking tanks that use lots of the heavy metals. It also means that a "metal maker", which in game terms converted energy units to metal units, may not necessarily be taking pure energy and making matter from it, but rather be engaged in elemental transmutation of non-strategic elements into strategic "metal". Certainly that is my own explanation for how the resources of a galaxy can be depleted because if you can do pure energy to matter, then as long as there is a sun, then you could be making more "metal".
As for energy, we have no idea what units are being used. The use of blades in wind generators and their variable output depending on wind speed certainly strongly imply wind turbines. How they are rationalized as producing enough to power the stuff in TA is not explored. However neither is how Necrons in 40K manage to power their Gauss weapons explored. In the old Necron Codex, humans in 40K had claimed to have "disproven" Gauss weaponry as impossible due to the impossibly high levels of energy required and/or the need for impossibly precise low loss transfer of energy within the weapon mechanisms. Yet somehow the Necrons did it, but we as readers don't know how. The same goes for TA. In both cases the technology used might as well be magic hand waving.