Now comes the fun part ! There is a series of bolts & studs that hold the pedal assembly to the body. 4 or 5 bolts from inside, plus 4 studs that stick up into the box that holds the MCs. Probably best to remove the box first, as things are likely to be rusty and need attention under there anyway.
Once all the nuts & bolts are out (plus the clevis pins of course), the pedals should pull away from the body, along with the brackets, pivots, etc. If they are reluctant, some taps with a brass hammer above the clevis pins should help.