Yaaaay!
I was feeling rather glum with the lack of notice my games have gotten before, this much interest has sparked a definite cheer in me.
The ten page+ Codex, alphabetically arranged for your perusal.
[url]https://docs.google.com/document/d/1zGVfb-nsudWgwNsmv4nRQlQUd9BhrPfup1slGVg05OI/edit?usp=sharing[/url]
A quick note, however: guns per-say haven't been invented, since the freak accident with some Chinese alchemists never occurred, so chemically based missile weapons have never been created. In it's place, however, spring technologies are far superior to what we have today, so springs are able to coil and hold much more force than in our world. Additionally, firecrystals (not actually crystals, just the resin from a totally OP tree thats destroying the entire ecosystem of the region it's found in) are these small, ignitable chips when spark up and cause a flame when smashed. You could potentially use those to make a pseudo-gunpowder, but people prefer to stick them on the ends of their crossbow bolts. A new invention, the spring rifle, has just been created. It uses springs to shoot small lead balls loaded with highly volatile firecrystals, far more volatile than you can have on a crossbow bolt. 
Originally, I wasn't going to have any sort of firearm thing, and just give you all crossbows. And then when I started working on the animals that you would encounter, I thought I better throw you all a bone. XD

Comments, questions, concerns?