I have made a number of them. I filed form 1’s on a trust because I didn’t have to ask permission from local LEO but the laws changed a few years ago. That took out the trust route but made it easier to get an approval back as an individual. The “silencer”, at the NFA branch calls it, is the “Type of firearm to be built” per 4. b., on your approved form 1 and as long as you didn’t make it permanently attached to a barrel you can move it from one gun to another.
I don’t know of any good books or what tools you have at your disposal. The way I made them calls for a lathe, mill and TIG welder but there are easier methods for sure.
You may poke around http://www.silencertalk.com/forum/index.php.