I think my alum has 3 1/2 legs, maybe 4".
I am going to take a look at my largest raised panel bit and see how much I would have to remove.
This isn't my first router table, I have had one for 20 yrs just upgrading .
On my other fence I didn't have split fence and never needed really...but my cut out was fairly large.
I all did my dust collection from the bottom , it had a sealed cabinet under, with a removable front for access.
I never had T Track for feather boards...just used a clamp to hold the feather board on. Same with a stop block if I needed it. Clamps pretty simple but would get in the way sometimes.
I Thought I would make a dust collecting box out of 3/4 hdpe on the sides and 1/4 lexan on the top with hose hook up and screw it one with counter sinked screws from the front of the alum angle.
I have been looking for some plans for a fence but haven't found one that suits me yet.
Thanks for the suggestions.....every bit of information is welcomed :-)