Unscrew the back panel
Get a socket wrench on unbolt the locking latch on the front coin door. A few turns will loosen the metal toungue keeping it locked and will rotate freely.
When that is done, open the door. Reach up towards the front sides of the cotnrol panel from underneath. There are a series of latches keeping the CP down.
Unlatch and open it up. Your cab is completely open now.