Technical Bracing cab like the one in my icon

I'm about to cut the top the top off my 3100 cab just like the one in my icon ...I see the brace that comes from the back wall down to the floor. ..my question is what should I do for the front . The doors are going to need a strong brace and I need some good advice. Thanks for any and all help

 

If the dash doesn't provide enough then run a brace from side to side behind the dash. You could run a short brace from the bottom of the cab near the lower door hinge and tie it into the frame