Ah. I see your issue.Look at my end of day tour, and you'll see what i am talking about.
To get an ingot cast, you need to pour molten aluminum brass over it. See Might Smelting/NEI for how to get that. After that, pour the aluminum brass over your ingot/brick-shaped item (the iron ingot you have in there is fine), and you'll get an ingot cast. After that, you can just pour the iron into the ingot cast to get ingots.
Again, for the crashes, just avoid mousing over the lava display. The fix will be in the next update.
EDIT: You also don't need the corners or roof in the smeltery.
Be careful taking them out, though; if you go in the smeltery you'll take damage and put blood in it.