Clearance for the HeadStock..
The Mounting is positioned to barely clear the back of the HeadStock Plate.
The carrage can be brought right up next to the chuck.
The Bracket also clears the extended Jaws of the Chuck when opened
to the 1" + sizes..
If you drill the 1/4" bolt hole little more up the long leg of the Bracket, you can mount the Router Bracket closer toward the front, making the leg of the Router Bracket a stop for the carrage, keeping you from inadvertantly cranking the Carrage into the chuck...