If anyone is serious about building a router or mill, Take the time to read through this thread, it is very long and will take hrs to read and is two sections long with about 4 years of posting but will answer about 99% of your questions.
One suggestion while reading it, A lot of the post are chit chat and a lot of them are use full, Keep a note pad and when you see something that sounds important write down the page number and post number so you can look it up later
http://www.rcgroups.com/forums/showthread.php?t=62920
Milton