While I did the basic write up for all 5 races, Dereck ran with Black Empire while the Infranites were always Marco's baby's . Additionally, Dave MacKay rather than Tom Frank was the lead artist who gave the look to the Infranites. Tom also took on more writing duties for Planetstorm for the UNE background material, inter alia. Wes Johnson designed a number of figs that were light and fast. If you have met the man (and Tom) this all makes sense.
The basic concepts of the races follow. You tell me if that is how you read them, play them and such.
UNE: The forces of the free world. They are the sci-fi equivalents of North America, Western Europe, and the ANZACs.
Fantasians: Modelled after Soviet Era forces with facism added in. While opinions vary, they are like lawful evil space-orks rather than the chaotic-stupid variety. I wish I never mentioned "walrus" in their description. However we went against type with the idea of Privateers and Kezyrists.
Infranites: Our version of space-elves. Earthy, high psyche factor, and arguably chaotic good. Pound for pound probably the most deadly (and I had to keep correcting errors in the weapon stats that made them particularly so). The Oth, Paache and Krayl variations were Marco's ideas.
The Black Empire: What can I say? They have "empire" in their name. Feudalistic, with strange penchant for hand-to-hand combat, and with generally the biggest point disparity between their line and elite troops (an Angel Flight is HOW many points?) they have a more fantastic feel to them.
The Machines: Goofy-tech to the 11 (Nega-spheres, disruptor weapons, HTH, early EMP weapons and such).Hive mind combatants, reversed with the advent of Omega Fiends. The Overlord Classes found in Planetstorm were my doing to represent various manifestations of "the other".
The funny thing about art is that the audience doesn't necessarily buy into what the author was trying to do. But that is my take on it, which is no more valid that those who actually buy, paint, and play the various races.