Long time friend of Youme here, but I've only just got TF2 and L4D, I've been playing them on my brother's account up until now. Its interesting to start at the begining of the new unlock method with none at all, especially as I had most of them before (with two people playing you get more achieves than you would otherwise so unlocks were never a problem for us). I've been using hammer for a little while now, I think I'm getting quite good but then again I could be way off with that. Unfortunately I can't show you anything I've done since I no longer have access to my bother's PC which had all my experiments on. Hopefully I should be dazzling you all with a stunning map in a month or so!