And don't forget the Access Panel Rule.
1) Calculate the required size and optimal location of the panel to allow unhindered access to components.
2) Reduce the panel in size by 20% and move it 8 inches forward or aft, and 5 inches above or below optimal position.
3) Sit back and laugh at the thought of maintenance engineers losing skin, blood and fingernails, and possibly dislocating various joints, whilst attempting to carry out so called routine maintenance tasks.