Doors with external hinges are much easier to fit than the ones with inside hinges.
First of all, get the fore & aft gaps as near as you can. Slacken off the hinge nuts, both inside the doors and on the A-panel. Youcan, as said above, enlarge and/or elongate the holes in both the dor and A-panel, but make sure the holes don't go beyond the hinges at full adjustment.
One the door fits the door frame with a good equal gap all the way around, tighten the nuts fully.
Then get a block of wood about 2" square and put it between the rear edge of the door and the frame. Brute force is then the order of the day to 'bend' the door until it is as flush as possible and fitting properly into the frame. I know this sounds a bit brutal, but it is how BMC dealers used to set them.