When we were about to refinish my h17 hulls, we decided to make cradles and so forth for the hulls so they would stand up straight. However, we had come to the realization that we wouldn't always want the hulls standing up straight, so we fabricated a simple system using 2 2x4" and two sawhorses.



It worked for us. Not sure about an A-class, you might have to make the 2x4"s wider so it doesn't cave in the hull.