Actually, yes! I've been meaning to update the thread with the last build pictures, but I've been really busy finishing the build and getting my two first brews in, and tomorrow I'll be going to the US for two weeks. Hopefully I'll have time to finish the build log when I get back!
In the mean time, here's what it looks like with some oatmeal stout going through the pipes :
and here's the full album of my second brew day : http://imgur.com/a/rkq7Y
As for the drain, I haven't actually installed the sink yet since I haven't found the model I want yet. It's also not yet connected up to the main drain. We did however make sure that the pipe was sloped downwards all the way to the house. So far it seems to work fine with water, I hope the slope will be sufficient for when there's dirt in the water, or spent grains...