You may be trying to say this correctly, but perhaps not, and it probably should be clarified. Yes, people often install oarlocks on various Old Town canoes, and Old Town even sells them. But those are gunwale-mounted oarlocks, and combining a sliding seat with regular gunwale-mounted oarlocks would be a huge mistake. The sliding seat amplifies your length of pull so much that only very long oars are suitable, and oars of that length must have the pivot point located quite far outside of the gunwales in order to have the handles positioned where you want them.
With standard gunwale-mounted oars, you can already exceed the amount of blade movement (in a semi-circular arc) that is efficient with just a minimum of arm movement. Using a sliding seat would just cause the swing of the oars to be much too long, directing the force during most of each swing in useless directions (in or out, rather than toward the rear).
Cartop Kayak Carriers
Sport Cases (Electronics)
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