That's plenty of info to be getting on with.

Also, good to know the scale you had in mind, I was definitely thinking about it wrong. 

For reference, a blue whale is around that long, and I found this scale picture to give an idea of how big these guys are.

[img]http://i1.wp.com/sandiegowhalewatching.com/wp-content/uploads/2014/06/blue-whale-stats.jpg[/img]

EDIT: By the by, the things on the bottom are not meant to be to scale.  It's from a size comparison thing, and the bottom are your options.  The scale is the little people above the whale.