It's strange but highly appealing.
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It's currently at 687 x 173, so even without the second banner it's over the 160px height limit. There's usually a 10px leeway in both dimensions, but it's 3px above that too.
The banner seen here was made by Blazaking.
I copypasta the sig in MS Paint and measure from the first visible pixel in the top left-hand corner to the last visible one in the bottom right corner.
So I'll use @The_Doctor's sig as an example:
It's more iffy on quotes in sig because of the space vB forces into them.