Um Dlakiiiii, this should be fine, NR has the same size banner as this one.
Uhhhhh
Pie.
If NR jumped off a cliff, would that make it fine too? No, srsly, your options for dimensions are either 250x100 (or less) or 468x60 (or less). Not 468x100. Also, though it's not quite surpassing the limits, the filesize of the thing is bloody huge.