Hydraulic to mechanical conversion - cable routing
You can run the cable outer housing exactly the same as the hydarulic hose. 

The main reason for using frame stops is to provide sections that don't suffer from compression of the outer housing under load.  A full run of brake housing could compress and use some of the braking power.

You could solve this by using compressionless brake housing, which has multiple metal bracers instead of a continuous coil.

NOTE I am NOT suggesting to use gear housing as brake housing.  They're different thicknesses.