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I mounted a Minn Kota Powerdrive 70# thrust model on the bow of my 18' 1990 Outrage in 2008. You can google
"Outrage-18: Bow Mounted Trolling Motor" to find a link with photos thoroughly describing the process, challenges and solutions.
It works well to this day, and if I were to make any changes, I might upgrade the power to somewhere in the 80# plus range.
I used the aluminum plate embedded in the fiberglass beneath the samson bit/line guide on the bow for my primary anchorage of the 1 1/2" thick aluminum "shim" required to clear the gunnel lip. I had it tapped and ground to receive A) the Minn Kota quick release base plate and B) the original samson bit. I swap the two back and forth dependent upon the mission.
It is reported that there are wood pads beneath the bow rail stanchions, but not the entire gunnel. I would suspect these are not sufficient for mounting with lag bolts.