Thanks so much. It's apparent to me that I asked this question to the right people at the right time. Thanks again!

: Doug, the short answer is yes it will be durable enough,,but you've left out
: the other essential part of the question,that glass and 'poxy stuff. Ends
: of the boat will wear a lot so only one layer of 6oz glass on 2sq."
: of an end will wear through quickly. Durability for a boat designed for
: 200lbs is a big difference than durability for boats designed for 400lbs
: or 100lbs,,which are payloads that might go into different sized craft all
: using 4mm ply.

: You can be in protected waters launching from a mud shore or in protected
: waters launching from a rocky shore. If it's mud then 6oz glass and 4mmply
: is fine, if it's a load of 400lbs and any chance that 400lbs is sitting on
: a rock (while unpleasant wouldn't be the end of the world for a single
: kayak and 150lb paddler), then maybe a little more glass would be a good
: idea. Careful launchings and landings are better than overbuilding,,I'll
: try it someday.