Just wanted to make a post because of the lack of recent or updated info.

I just installed a Sikky Handbrake with a Wilwood GS style master.
Had to fab a bracket for the base of the brake. I used 2, 1/4- 20 nutserts mounted into the body next to the shifter base. The 48" lines are a bit much. I would get 35" and a 40" line. Make the smaller line a straight -3 and a 90* -3 and the longer line both with 90* -3 fittings. I had to use a straight going into the proportioning valve and I dont like it. I found that the way my lines are ran lock the passenger front tire and driver rear despite all the info saying that it will lock up the same side tires.

Plumbed the inlet on the Wilwood master to the Master Cylinder line using the -3an to female 10mmx1.0 fitting and then plumbed the outlet on the Wilwood master to the proportioning valve using the -3an to male 10mmx1.0 fitting