Roger I have to disagree with what you said about needing the box around the router. Although I know of no experiments to back up what I am about to say I do know that the physics of it is sound. The ability of a router to throw material is proportional to the mass of the particle being thrown. It's similar to you trying to throw a baseball compared to a ping pong ball. The ping pong ball has low mass and is heavily affected by the friction it encounters while going through the air. So too should the particles being thrown by the router. The heavier particles are more likely to escape the draw of a dust collector. The lightest particles should slow down the quickest making them more susceptible to being drawn into a DC outlet. My own personal system is fence mounted and it collects 90-95% of all the particles and I don't notice any haze in the vicinity of the bit. Boxes around routers are a very risky business. While a number of members have stated that they have done it without having the router heat up. I used one at a place I worked years ago that was in a very large box, basically a free standing table-cabinet and after a half hour I could feel the heat coming through the plywood. That's what turned me off the idea. It also makes the router inaccesible for adjustments and bit changes.
So far we had only been talking about getting a basic table together to get started with with possibly only a straight edge for a fence so getting into the DC aspects of using one may be a bit premature right now but even just fixing the end of a shop vac hose close to the bit will make a difference and won't be too hard to just get going with.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.