Hard to tell exactly but it looks like the sides are sharing the load with the beams, and the boats may be slightly tilted to the center? Not an idea Hobie 16 sailors are going to take off and run with <img src="http://www.catsailor.com/forums/images/graemlins/smirk.gif" alt="" />

>>Wouldn't that put a lot of stress on the sides of the hulls?

That was my thought too. Seems to me you would want to spread the weight between the lower and upper hulls. And I don't see any structure that keeps the boats from falling over. All I see is that they are all tied together. Of course it's pretty difficult to see details from the picture.

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If it is spread out over enough area it wouldn't be any worse than sitting on the bottoms.

You have to be aware of where the bulkheads are but still you have a foam core all along the sides - most cats are solid fibgerglass right along their keel line. You can ding and dent the side unlike you can the bottom.

If they were mostly supported by / at the beams, that would probably be OK.

And maybe support the side on memory foam.