iPhone 5 in Speck Case Mount for RAM Mounting System

I have a really nice RAM mount for my iPhone 3GS that I use on my mountain bike to track my rides. The 3GS finally died so I want to use my iPhone 5 instead. Except I don't want to take my phone out of it's case every time I go for a ride. So I designed a mount that fits my iPhone 5 while still in it's Speck case and screws onto a standard RAM mounting bracket.