Looks good!
I use this stuff a lot. I used to cut them with a dremel, but later picked up a tiny miter box and a hobby saw. it works well. You usually still need to clean them up a bit afterwards with a small file. Best tip I can give is don't try to conserve material. In other words if you need a length thats 3mm long DO NOT think that cutting a 6mm piece in half is a great idea. With stuff this small you need something to hold onto while you cut. If not it ends up a disaster.
I've also found that the aluminum is much easier to cut than the brass. At least for me.
Keep up the great work.