Time for you to check out the Albert Orkstein lists!
Heh. I started out with an Orkstein list, but the restrictions are brutal - the focus on sloooow units and point-sink Gargants means you can easily get out-activated and out-maneuvered. It does have its own advantages but I'm looking for something a bit faster to deal with all the speedy opponents out there.
Also, I really don't understand how the Kustom Upgrades are supposed to work - I can't barely make any sense of the Oddboy rules as written, and I can barely guess at the intent. Maybe you can help?
On Gargants, I can't see why you would take almost any of the Kustom Upgrades, even though they're free. They replace an arm or belly gun - why would you replace a BP3 MW twin soopagun with a BP3+D3 mega-lobba (that you can never fire since it's not MW, and is therefore different to the Gargant's other barrage weapons)? Why replace a BP3 MW with four AP5/AT6 guns with significantly shorter range? Is it really worth giving up a third of your firepower for D3+3 extra power fields? The only ones that seem to be reasonable choices are the supa-zzap (to get a second 3+TK(D3) shot alongside the lifta-droppa on a dedicated titan-killing Gargant) and the snappa.
Then you see the bit where "Oddboyz can also take Kustom Upgrades", with no explanation of how that's supposed to work. The upgrades pretty clearly say that they replace a Gargant arm or belly weapon, which Oddboyz don't have. Does it replace the Oddboy's soopagun/zzap gun? (Why would it? It's not a Gargant arm or belly weapon.) You might guess that perhaps they could upgrade a Gargant in the same army, but the mega-choppa explicitly tells you how it works when applied to an Oddboy... and none of the other upgrades do. That's without even getting into weird things like an Oddboy can technically take a Transporta upgrade, which presumably does nothing at all since he's not a Gargant.
Also, Mega Gargants don't have reinforced armour and die incredibly fast (and they can't take upgrades), so they seem like a huge waste of points. Also also, it has a formation entry for Drop Roks, but no profile for them.
Basically, the list doesn't really seem finished or fully thought out. (Or perhaps is just very poorly explained for a new player like me, but I'm reading the rules pretty carefully - the rules just aren't all there!) The Ghaz list is very clear, very flexible, and seems pretty well balanced (relentless Landa-assaults notwithstanding) - it just doesn't encourage players to take Gargants.