We have a table-top drill at work, with a feeding table. That is not far from a milling machine practically is you just purchase some milling bits for it. After machining I always anodize the parts to make them stronger, especially the threads. Anodizing is quite simple and fun to try at home if you're interested. Here's a good link.
If someone plans to make a similar servomount, you have to be carefull because there is not much room for it. If you look at my Mission (the picture was posted somewhere earlier) the part needs to be really thin in a coulpe of places, especially over the servo. You also need to be carefull with the copyright laws ;-)