I've been away for the week, only just saw this, sorry for the delay in responding. I took the iron and some wood to build a bunch of hoppers for the witch farm off the North portal. Also, the glass for the item elevator in the same build. It's a community build, and I've built the rest of it with my own resources (which involved a lot of iron - 50 cauldrons!)
Also, I didn't realise the dynmap signs were fixed, I had put one up earlier, but it wasn't adding to the map, so I've fixed that.
Perhaps we need a better way to signal when we use stuff, maybe a book in the donations house, that we can write in when we pick up resources?