Very clean cutaway considering the fact you used home tools! I must say, that hasto be one of the best hand cutaway locks I've seen & when i first saw it I thought you just made two sweeps with a 6mm mill bit.
I could see what I like to call a 'super cut' in your cutaway, a cut where you push the boundries of removing material.... and that was in the key on the other side, if you were to mill into the key half way into the crater for the pin & also the outer pin itself, you would be able to see the inner pin and how it sits on the bump in the key.
Top stuff though, can't wait to see more

Here are some of my cutaways, I've only just started out myself & absolutely love doing it..... very theraputic
http://img7.imageshack.us/img7/7196/cimg5773w.jpgI did have more but sold quite a few which I was a bit sad about since they were out of my collection, but it's all for a good cause & I'm buying my own milling machine next week

Here are the first jobs for it
http://img13.imageshack.us/img13/1567/cimg5774.jpg