Hi,
Create a sketch to extrude, then create a plane at 90 degrees to that, where the top of the part was going to be, on this plane, create a sketch with an angle (on each end), then create a plane using the angled line of the sketch and the first plane that was created and extrude the first sketch FROM/TO using the angled plane.I d0 this for each end and dimensioned the sketch. Now I can drive the part with parameters. Be sure to keep the angled sketch that you draw away from the extruding sketch otherwise you might run into problem.
Cheers!