I built these boats...
I used to work with Randy in 1983 when he was designing and building the prototypes under the umbrella of my dad's company Quintus, Inc. Seeing the "Brecchi Design" name and logo on the ad above brought back a lot of memories.
I think the boats were well made, and yes, they handled much better when full of cargo. In the April 1983 trip mentioned above, Randy was using it as a support vessel for the accompanying kayaks on the trip.
I recall a combination of polyester resin/woven fiberglass roving/PVC 1/4-inch foam core sandwich construction, which was vacuum-bagged in two separate steps. I recall being quite proud of the Adiprene L-100/MOCA urethane cast stems in the prow and the stern, designed to transfer the shock of impact. Reading about the repair on the boat that required a fire to cure the epoxy is eyebrow raising; it sounds like quite the adventure.
I enjoyed Randy's company very much; he often made me laugh with his clownish humor. I'm sad to report that he died of a heart condition about five years ago or so, while doing work as a firefighter, I think somewhere in New Mexico. It's been a great trip down memory lane seeing these photos and hearing these stories, and I hope this information is of help. Let me know if I can help further.