hey guys, maybe this will help a little: http://www.thingiverse.com/thing:817716
Maybe not exactly what you wanted, but it might be a start. Towards the end there is a link at tinkercad to download or edit for 3D printing. Let us know if you end up with a rubberized case/holder design.

By the way, I think the author, Julia Truchsess, has posted here in this forum in the past.

— Duane