Nice.
As a rule of thumb, to determine your correct distance from the steering wheel, sit up straight and extend your arms over the steering wheel. The proper position for best control (and comfort?) is for your wrists to sit on the top of the wheel.
For me, though my knees are very close to the dash, sitting back further causes tingling in my fingers and pain along my IT band, which runs down the length of my outer thigh, from the top of the pelvis to the shin bone. By simply adjusting my distance and the lifting the seat with those spacers, I drive from Asheville to Charlotte (2.5 hours) with no stops and with no discomfort. No tingling in my right hand and no pain along the right side of my butt.
If you can't sit properly using that guide, then I would start drilling.
But that's just me.