I've posted this link many times and it has all been done before -

On this site -

http://www.kask.org.nz/do-it-yourself

or go directly to the PDF -

http://203.86.194.7/Sites/kask/gems/RudderPedals40V2.pdf

The pedals are shown on a track for adjustment. You might want to stretch your legs during the day or be wearing footwear with differing sole thickness on different days, hence the adjustability. The track could be a plastic tube, bolted to the seat and fitting into a holder glued to the fore bulkhead.

Note that the rudder lines auto-adjust. Some commercial units now do this too but we've been doing it for decades.

If you want no slip, and we don't find it necessary, sprinkle the epoxy with fine sand.

Alex