Unless I'm mistaken, Katoki had no involvement with Five Star Stories or Zeta Gundam. You may be thinking of Mamoru Nagano. Katoki's the overrated hack who designs things very clean, very sharp, very mechanical-looking and refined... and ultimately very boring. Well, mostly. He does some good work. (Just got a Geara Zulu!) Really the only thing I hate about Katoki is that people treat him like God's gift to mecha fans. Not every mecha design in the world is made better by Katoki's magic touch.
One thing about the Gundam novels - cool space battles between giant robots do not make for good prose. :) Seriously, there were parts of the book that felt like I was reading "and then Amuro shot the guy, and some other guy shot back, so Amuro returned fire..."
There were some interesting bits of detail in the book: for instance, at one point Char's shield gets hit with beam rifle fire. But it doesn't explode like it would in the anime - instead, the way they describe the damage, the shield gets a whole lot of microscopic perforations from the heavy metal particles in the beam. The shield still appears whole but it's rendered worthless by the damage.
Also, not only did Char not get the Zeong, he didn't get the Gelgoog or Z'Gok, either. The "Duel in Texas" was actually between the Gundam and Char's Zaku (Zakus get some respect!)
I guess technically I've started a GB entry: I'm still trying to finish up that HGUC Zaku, but I needed a little change of pace so last night I put some work in on the 1:144 Zaku (the original one...) - doing mobility mods as well as cosmetic mods along the lines of that video I linked...