i like the idea of using soft plastic. I could go out there with the plastic and a cordless dremel and work at it until the template is perfect....
As far as the shield goes... i'm baffled as to how to make the plastic sliding thing.
I guess if I'm successful I will have several made and i'll sell them cheap. Is brushed aluminum the material of choice? say... 1/8" thick? I am pretty sure I'd have to use something like nylon bristles on the underside instead of the moving plastic shield.
Didn't somebody have a shifter gate made already? I could use that for a template.
I think I would want the slots a little more open than usual to allow shifting more directly instead of at 90 degree angles. know what I mean?