Ok let me go back and go over some things.
Two boats that were built to light were unusable because there was so much flex it was trying to crack the floor and pulling glass away from the wood, one was a perow the other was a merlin canoe.
I knocked a hole in my tv with 4 ounce on the inside 6 on the outside ,glass inside ripped when the strain got to be to much,had a complete penetration of the hull.Since that time I have used 6 ounce with full coverage inside and out running the same water with no full penetrations have hit so hard that I cracked the wood before but the glass always held it.I have seen the same thing happen with numerous boats
I am going to make this statement again , heavy glass needs to be on the inside of the hull. When you hit an object the outside folds ,not much strength the inside has to strech (tensile strength) . Take a piece of 14 gauge copper wire and bend it ,that was easy, now tie it to the front bumper of your truck bet you cant pull it into.
Chuck builds a great light boat and is an excellent paddler, for every rock or stump Chuck hits with a current pushing him I hit 100 or more his boat would not take that on a daily basis, if you fish in the best places here it is just a fact of life and you may be moving at 10 or 15 miles an hour when you smack one, then coming back up river you may have to drag over solid rock for 1/4 mile with a inch or less water running over it.Now this is with 150 to 250 lbs in the boat in gear.
I am an extreme user of my wood boats and believe me I test them hard and rough,so does Darrel.Chuck just about had a fit when we drug our boats up a concrete ramp and didnt unload them and put them on the bars of the yak trailer.
When I make a statement about what it takes to handle certain scenarios ,normally it is not hearsay it experience talking
Ron