Keep in mind that, as nice as the Lexicanum is as an index of sorts, as per its creators the IP does
not have a uniform canon (see quotes
here), which means that you should not be surprised by the various sources contradicting one another - something which isn't quite addressed by the wiki, as it still misleadingly suggests that every single product is part of a greater continuity, often merging information from official products that were never meant to be compatible, and often resolving conflicts based on the individual fan-authors' personal opinions and interpretations.
By the very nature of the setting, nothing in the Lexicanum is "wrong", but it would also be false to treat it like some sort of universal truth - this just does not exist, as Andy Hoare and Marc Gascogne explained in the link above.
Many conflicts can thankfully be resolved by simply pointing to the Imperium's decentralised lifestyle, for even though every single world pays allegiance to Terra and the High Lords, they can all have their own unique cultures, government styles, economies, currencies, fashions, etc.
In terms of currency, for example, the aforementioned Dark Heresy
RPG from
FFG uses Throne Gelt or Thrones in the Calixis sector, whereas Games Workshop's Necromunda game uses Guilder Credits. So if you wish to write about your own place, just make something up like all the official authors do.
In regards to common materials, stuff that shows up with a certain regularity in the sources I've read are armaplast, durasteel, duraplast, flakboard, etc. Again, just pick something you like or make up a new material whose name conveys its natura.