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Having a single metal frame is fine as long as you aren't planning on attaching the doors to it solidly. The more solid it is, the worse it is.
If you want to prove it to yourself, take a hammer and press it against a running motor and then put your ear to it. The stiff handle transmits the the vibrations (noise) to your ear. If you have two doors solidly attached to the same frame, then one does a good job picking up the sound and then it is transmitted to the other door that radiates it on the other side.
You might get away with a single frame if it's attached to something really heavy like a reinforced concrete wall...
-tINY
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