Depends on how big your feet are!
Get on the build table and mockup some pedals from anything you have lying about card etc and see what you can get away with clearance wise
I have a type 9 pedal box and find it just enough room, my feet are bigish but not massive (size 11)
Spend some time getting enough room to suit you its one thing you done want to try and change later on once its finished
We all know what a difference an extra inch could make
