Half an inch is too large to make it look right. When I hang doors, my opening is 3/16" bigger than the door size. With double doors I go 1/4". If you want it to look right, you're better off taking the existing frame and doing it properly. Also, your existing frames will most certainly not be level or plumb, so getting a door to fit properly will be tough. For your double door, when you do get it in, pick up some rare earth magnets from Lee Valley. Put one on the top of the door and one on your frame. Silent, strong and much easier to install than a ball catch.
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