As I type this, my Leviathan barding is being crafted.

[NyneAlexander]

so, if another player can craft the barding using another player' mats, it means it can be put to sell on the market board?

yep. a couple have already sold on excalibur for over 1.5 mil (someone said 2.2 mil for one). The ingot required for this craft is almost as much of a pain in the butt as the levi barb. The ingot requires two 500 myth mats, as well as extremely high master goldsmithing.