Would it be possible to create elementals?
Living manifestations of the winds?
There are those incarnate elemental things that popped up in early WHFB editions, so I'd say yes. Takes a powerful mage to do it though, and since you guys aren't as innately predisposed towards personifying everything like humans are, you'd need to progress some along the divine manifestation tree before you can develop them.
A thought: Is there any reason not to make Saurus who can cast magic? I mean, if we can edit Skinks that way, presumably we can do the same to them, and the results might be interesting.
I know it got clarified, but hey may as well throw in a few more cents - it's possible to do, and it might make for a cool character idea for a saurus to be fitted with a type of magic that fits the purpose he was made for - an assassin saurus with bloodbending or something as a random example. But on the larger scale, it's more efficient to let the saurus handle fighter/tanking duties and the squishy skink spellcasters hang back and focus on their thing. Lizardmen don't tend to multiclass.
This doesn't preclude saurus having magical effects applied to them that they then use in combat, like the Spellscales omake, since that'd more be like them being given magic weapons and the like.
Been thinking, was it only Skinks who escaped Chaqua or did all different breeds of Lizardmen escape? Because it'd be a neat character background.
Also, is there a benefit for building cities/sections of the Geomantic Web at certain locations, like the planetary poles, or along the equator?
I'd say that while it was mainly skinks, all breeds except slann escaped Chaqua (another reason why the Communion was suspicious of Teninhuan for a while, they weren't sure if he left their siblings to die or not). Plenty of room for character background of all types!
Not ... inherently so, but the completion of shapes tends to offer opportunities. For instance, there's an option currently locked behind a research project you guys haven't taken yet that allows you to do something in the open space between your original four cities that'd give a fairly big boost to the 'how many cities do we need to level up the Web' counter.