This is what I did: Thoughts on a small dust collection system for my workshop?
That thread has a lot of discussion on the subject. Also, you probably want to pay attention to MBellon’s various posts on the health hazards of dust. If you’re going to be using this in an enclosed space, then personally I agree with MBellon about the importance of using a HEPA filter to save your lungs. And a Dust Deputy to extend the lifetime of your HEPA filter is a cheap investment that pays off fast – the HEPA filters are expensive.
The Nomad is nice for this since, being already well enclosed, all you really need is a hole in the back or side wall, and enough vacuum to keep negative pressure inside the enclosure – it doesn’t take much (I prop the door up 1/4" to allow for better airflow – the Nomad is almost too well-enclosed). I never got around to making a dust-collection head unit like FlatBaller designed – I just use a collet fan to blow the swarf into the air, and let the vacuum handle the airborne particles. Then, when done, I pull the hose off the back of the Nomad and use it to vacuum out any of the heavy stuff left behind. For an occasional user like me, it’s enough, but if I ever got more full-time into it, it would be fairly easy to add an internal hose and gin up FlatBaller’s design as a straight enhancement to my current setup.