Using metal studs with a suspending ceiling
"Lease walls" are built all the time by attaching the top track directly to the ceiling grid with framing screws. Entire floors of high-rise buildings have the drop ceilings framed before the first wall is ever built. Doors are put in these walls. I wouldn't recommend it for an 8' solid core door, but it will be fine for an interior pre-hung unit. You might want to consider 20 gauge studs for 10' walls (that's what I would use). You can probably "get by" with 25 gauge (what the big box stores sell) on 16" centers if the wall isn't likely to get a lot of "abuse". As long as it's not a "fire rated" wall there's no need to go to the deck.
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