the pedal box is actually really easy. in the photo the pedal box behind it is standard and the one infront it made to fit my car.
all you do is put it on a diet. cut alot of one side off so it all fits in. then used the spacer off the s13 firewall so it sits in the right position. Its not 100% finished. i want to weld another bracket on it so the pressures not all on the firewall when the clutch is engaged, also will put a return spring on it as you have to cut the mounts off from the standard spring. Other than that you just have to shape the pedal to fit and i also flattened the firewall a so the master cylinder sits up flush