Hard Dinghys out there?
We didn''t want to risk abraiding our inflateable, or haing it puncture ont he boarding ladder. So we made a doghnut of closed cell foam in a light canvas, attached with velcro loops. This would work well for a hard-dink too.
We used excess foam from making the new cuhions. So 1-1/2inch closed cell.
This is not going to be relevent to you, but our dink still deflates and packs down more or less as small as ever (still fits its bag and its locker despite the doughnut)