DIY rudders and DIY rudder pedals is the only real way to go though you can buy rudders cheaply from China. This type of rudder - https://canterburyseakayak.wordpress.com/daggerboard-rudder/ These are the types used on sea kayaks- https://canterburyseakayak.wordpress.com/rudder-types/ How to make your own pedals - https://canterburyseakayak.wordpress.com/rudder-pedals/ Read the PDF, middle of the page for the link. As for really long distance expedition kayaking, circumnavigations of places such as Australia, entire Alaska coast, a Nordkapp with a rudder. Paul Caffyn started with a skegged Nordkapp but increased his distance per day dramatically once a rudder was fitted. His rudder pedals are similar to the above mentioned in the PDF though the hinge in at the bottom of the pedals, not level with the ankle. He also didn't have auto-adjust rudder lines or easily adjusted pedals as I didn't design his system. My kayak? Plywood as it less likely to sustain damage than a glass kayak and is nearly as tough as plastic. It is also a lot lighter than plastic, near half the weight of some. Sorry, you will have to build your own plywood one. It is easy enough to do.