Looks pretty neat.
FWIW, I wanted my t-tracks running left to right, not front to back. That is because at maximum capacity, the router extends past the front of the front rail.
So if I was working on anything near the maximum workpiece size, t-tracks running front-to-back wouldn’t provide an easy way to clamp the front of the workpiece.
With my left to right clamps, I can clamp the left and right edges of a large workpiece about 3-4" back from the front edge. Not perfect, but not bad either.
My t-tracks sit on top of my spoil board and I don’t use filters. The t-tracks can be removed when I switch to other fixturing methods.
Here is my method:
I can add more pieces of t-track if I need more support in the middle.
NOT FOR EVERYONE, because I have easy bottom access to add/remove my t-track.