Looks very nice!
Love it, you did a very nice job here mate!
Maybe take a look at CraftBook source code.
They've also got the custom recipes in furnace and maybe this can help you.
(not sure though)
Bug: When I "logged in" (just choose a username) and than I change the currency, the donation goal is not changing currency.
Found a little bug in the Monthly Donations Module, I put in 15 euro, but it says 11.28 EUR, I guess it counted from dollar but on Monthly Donations Module it says :
Also I can't make a item, it says "Please fix form problems." < This was my fault, I didn't select the server.
Very nice by the way, I hope the integration comes soon, very nice!