OK, I was tired of not having a real place to plant my left foot. I have seen a few other approaches but had not seen one that was particularly satisfying, so I started from scratch. The concept here is that the pedal is very solid, adjustable and looks factory. The pedal cover used is a factory brake pedal part with the rubber tang on the back cut off and the stainless plate flattened.

The pedal can be loosened with two allen bolts and slid up or back with about two inches of travel. I fabricated it out of aluminum with the exception of the clamping plate on the back side of the pedal mount, which is steel. The entire assembly is bit heavy for what it is (about 3 lb), but this was a prototype. It could be built lighter now that the details have been worked out.

The bulk of the assembly fits behind the driver kick panel, which required only slight modification as shown. Still need to radius edges and polish up the pedal arm, but functionally it seems to work well.