Hey Dan, After sleeping on it i thought I should have added the originall helix roll "way in the back" with a long tail leading up to it, so it appeared to be unrolled from a distance. More to the effect. :o

Extrude the body out:



Select solid and perform a second click for drill down face selection to select front face.



From front view select crossing lines and trim.



Drill down face selection and extrude using "set dir" button.