: Can anyone lend some advice and instruction on how to convert a Tred Avon
: double into a triple? I'm not needing a full size cockpit in the middle,
: just something big enough for a small child, but I would like a full size
: coaming. I'm assuming the rear cockpit moves back "x" amount,
: and the forward "y", leaving a space in the middle.Any
: suggestions on these dimensions? At this point I'm not interested in
: purchasing a new set of plans, or kit, for a different type, I'd like to
: work with what I already have.

Here's a starting point. Look at their catelog or their online page. Both the double and triple cockpit kayaks are shown. Take a ruler with millimeters, 32nds of inches or some small measurements.

Measure the two kayaks and their cockpit placements with your ruler. Prorate the overall measurement to 21 feet and do the same for each measurement of the cockpits shown. You then know how far from the ends the company places them in terms of feet and inches.

Randy