In the table I am currently building:
Top dimensions: 24 x 48 inches, 1-1/2 inches thick
Placement of router axis: 8 inches from the front edge (long edge), centered between the two ends.
Depending on the method of support you're using with your top, you may not be able to clear all of the protrusions on the router. By moving the router to the edge, your fence has to be mounted on the entire length of the table. This is a large and difficult to maintain fence. I have a 48" table with a 54" fence made of 8/4" x 12/4" solid maple stock and I'm constantly checking to be sure it is "true." It is also a genuine pain in the back and neck to work with that size table continuously. I still have the centered baseplate 2'x4' top but I use a 2'x4' top with two baseplates centred in each end.
1) Most work doesn't need great depth between the bit and the front edge. Eight inches is adequate.
Interesting observation. Agreed, in most of what I've worked on, I've seldom used the bit removed from the fence. When I've used the bit remotely from the fence, I've switched to jigs or other methods (skis, shiis, )
2) 24 inches of infeed and outfeed support.
Agreed 24" infeed and outfeed support, except when you position the fence diagonally, then, you suddenly find that that support has disappeared. After awhile I found that I would automatically mount a short fence diagonally. Only then would I remember to replace it with the larger fence. All other forms of fences become expensive and cumbersome as well; i.e. tall fence etc.
3) For most work, the rest of the table is available for holding workpieces.
I found that it gave lots of space to pile up bits and pieces, until I built the two hole top and then, all kinds of things started to happen. I would do two setups at a time and suddenly my error rate went down.
4) When need arises for more than eight inches, working from the back edge gives one 16 inches of workspace. Still 24 inches of infeed and outfeed support.
Really hard on the back and neck.
5) For those rarer incidents, working across one endg gives one 24 inches in front of the bit. Problem is that infeed and outfeed support is now only 12 inches.
This will be a rare occurrence indeed. Just too painful and you can't keep an eye on what's going on.
6) I might add an Incra LS positioner system on the table at a later date.
I'm a firm follower of the OakPark method. I don't need positioners.
Cassandra, I'm disagreeing with some of your philosophy, from my experience and experiments. However, had you not had the intestinal fortitude to speak up and present your views, a discussion could never have taken place perhaps of benefit to you or others. However, I may not be correct either. We'll know only when the rest of the membership steps up to the plate.