Ok, well it turned out to be 5 holes, but again, wood putty is your friend. I initially did not take the control panel into consideration. Last night, when I was just on the edge of sleep, I shot wide awake with the realization that I was just looking at the frame through the place the CP would eventually be. I thought I had plenty of space when in fact I was eating into the space where the CP would be. Trying to be too safe, I had only made one pilot hole just to get an idea of height and look, so I did not see this coming.
So, this morning I used a clamp attached to the back of the cabinet to adjust the height for the top of the brace. This way I could adjust and go and look in front, from a little distance, without hands on the frame. Once I found what I liked then I marked it, drilled it, and bolted it together. I took out the top bolts and laid the brace down horizontal and measured it level. I then took 2 wood blocks (the same type as I have been using for my corner braces) and glued them for this just below the side rails (Another idea I stole this idea from my Taito cab). This way I can unbolt the top and bottom rails, attach the monitor to them, and then lay the monitor in the cab in a horizontal position. I can then bolt the top and bottom rails back on and raise it into position. This is a safety feature for the monitor really.