Hey neat, I'm on this list. :)
(I'm Matt, of Mithgarthr Entertainment and mod of the 5E sub on Voat; I literally just pulled that ring out of my rear last week before a session to make a troll fight more fun.)
You can find Stonefast here: http://mithgarthrentertainment.com/downloads/Stonefast.pdf
The Sylvan Temple has been taken down, as it appears in its final, more polished form in this: www.rpgnow.com/product/148018/ME504--Campaigns-in-Cairnvarthi
Thanks for your interest!
The disc planet Cairnvarthi: It was forged by the gods, and is under constant threat from Orcus and The Thrir. Do you have what it takes to withstand those forces of Chaos? Those who do have much glory and treasure to claim! Drawing inspiration from Norse, German, and Celtic culture, Cairnvarthi...