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You need to start with looking at the floor joists. There's a good chance they aren't sized for a decent floor load.

You'll need to do some calcs on how much roof load winds up being transferred to the floor joist at the dormer corners to figure out if you need to double up, triple up the floor joists where the dormer corners are.

You already know the roof framing isn't very stiff. The cross ties will help out - check the span tables to see if it's enough. If this is a hipped roof, run them both directions.

These can get pretty costly on call backs for drywall cracking. Movement that's structurally OK for a roof is not necessarily OK for drywall. Don't plan on attaching any of the drywall to the roof structure and float all the corners if possible.
 
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