For Eisenwulf_0861: i will add a version for 0.15 (thanks for your support ;D)...and i'm thinking to add more details.
For Bordo: thanks for giving more details to Eisenwulf_0861, but i don't like spoilers... i mean: if you're interested to know what's inside this mod, you need to download and play it (and you will like it, i'm sure :D).
If anyone think that the craftings are impossible, i tell you that craftings' difficulty is proportional to the player level (i tested this mod in a session of 14 hours, and the craftings aren't expensive, for me).
After this reply, if you still think that they're hard, i suggest you to visit my page, i've a lot of mods for make your gameplay easier.
Here it is: https://mods.factorio.com/user/diegopro77
