Beyond the drain tubes there are a couple of other reasons for leaks. There is a small plastic piece, secured by one screw on each front corner that cracks do to age. Haven't found this yet by searching but guessing it was over five years ago.
Another thread I did find...
The sunroof opens in two ways. One way it will slide back below into the roof without a problem, second way it will tilt up in the rear only. Based upon your measurements there should not be a problem but slowly open it small amounts while checking for clearance.