There are couple of options for the throttle pedal. The Hawk can use either a mini pedal and cable or as I have Gerry supplies an original throttle pedal. This fits through the roof of the footwell and has a cast housing sitting in the engine bay to which you connect the linkage to the engine.
It is a bit hit or miss getting the location right. I messed up initially and made the hole in the wrong place! I should have taken more notice of the blog of Jon Tower who states it should be about an inch from the end of the footwell. Still I got it right in the end and not too much damage done! I added a aluminium plate to cover the excess hole, you can just see it here.