The measurements are:
Top 31Wx12L the front is 21W
the area from the back to the angle cut is 7 7/8L
the remaining of the angle is left over from the 12L measurement
also it is 3 tall (just the same hight of my J-sticks
Bottom 44Wx20L and the front is 23 5/8W
the area from the back to the angle cut is 9 3/4L
the remaining of the angle is left over from the 20L measurement
Box 4 1/4 deep in the back and 3 deep in front
the sides is 3/4 under the CP (clearance on both sides)
the front has 1 1/4 lip clearance (to fit the hinge)
What i did was make the top of the CP and then the box! this gave me a better idea on room for controls and the foot print under the CP
more to follow when i get more time to post!
also, Umpa you CP looks good!