Building a race car from nothing presents a heap of issues, so many that most wont even think of undertaking such a project. You always have to think about how many jobs a single mount can do, multitasking saves weight, clutter and makes removing items a little easier.
I built a hydraulic handbrake setup and added a wilwood bias lever into the gearbox mount. The handle for the handbrake raises 400mm up to sit next to the RB25 shifter. Ergonomics in the cabin will be spot on.