40 Ibs of Adamantine, 4,500 IM in reagents 105 Ibs for their VS weapons and armor, and I forget how much for the rest of their gear, but yeah. In relative terms, you could probably expect the average fully trained Praetorian to cost 10,000 IM to create, train and equip, with heroes probably having the WBL of an equivalent PC.
That goes up significantly if we try equipping the fully trained ones with Construct armor.
So it's a pretty big resource investment, but as they are fighting on the front lines, we will quickly gain a core group of elites. It's a pretty nice stop-gap that only costs us money. Being able to just forge Outsiders is obviously better, but that's being a different kind of rich altogether.
Edit: So it's around 7,368 IM, 40 Ibs of Adamantine and 105 Ibs of VS.