Our pedal box is from an 06 WRX so it's got the frustrating drive by wire setup. I really like the look of the pedal and prefer the DBW setup for simplicity so I figured we'd try to make it work. Here's how we did it.
First, we figured out where the pedal should go using a piece of plywood.
Used some 1/4" flat stock to make it official. (Those are my welds. Isaac's are typically a little nicer.)
Taped some rare earth magnets to the back of the pedal for ease of determining location during mock up.
Once we figured out the location of the pedal on the bracket, we drilled the holes. Here's the hardware we used.
Here's the nearly finished product:
We used some drawer liner foam strips inside the pipe brackets to take up the space. Only thing left is to buy some rivnuts to secure the bottom of the bracket to the vertical firewall brace.