1) They take 1 month to craft. The cooldown resets once daily, and you need 30 bars to create one weapon.
2) They require 18(3, 6, 9) Living Steel.
3) They require 18(3, 6, 9) Spirits of Harmony.
4) They start as a ilvl 463 blue(Which requires 3 of each non-ingot item), turn into a 476 epic(Which requires 6), and end as a 502 Epic(which requires 9). Each stage is BoE, however, you must have the prior stage in your inventory to craft the next, which means you will have to wait the entire month to get the epic if that's what you're going for.
The mat requirements(using current AH prices) are 4500g in Living Steel, 4500g in Lightningsteel Ingots(Ghost Iron bars +50g surcharge per bar, which is negotiable), and about ~1500 in Spirits of Harmony, given the best guess estimate I got on their value.
All told you're looking at about 12k for an epic 502 weapon(Which isn't bad), if you want me to provide all the mats(Though I'll have to provide the Spirits anyway).
We can work out something less, and I'm looking for about 20k just for using one month of my cooldowns to make you something. =p
But they're awesome, raid-finder level weapons, and they all look really cool.
You can send me a mail or something if you're interested!