Craig...remember, I ain't small and I drove it for as long as the 10 gallon bladder (the car's, not mine) would take me. The footwells are long, but narrow, so shoe size (width) is the most important consideration for Arntz/Butlers. My 13EEEs did ok in Simpsons or well worn boat shoes. There is no room for a dead pedal. But it's comfortable enough.
I forgot you actually saw mine at the Fling.
Only potential problem I ever had was carrying 4 little 2 1/2 gallon plastic gas cans in the passenger footwell while I was still smoking when we did the Death Valley trip...that and me being an Armenian following a Turk into the desert. Historically, not the best move.
Wished i would've grabbed the Nardi out of it before it went back to Massachsettes.