I had imagined that you would operate the Baby much like a cross-country sail plane or balloon - with a ground crew. One of the less happy events that could happen is to lose air-worthiness in a strange place where the plane cannot be stored safely inside pending repairs.
So, one of the really neat opportunities you have is to design the towable trailer which is highway legal and can be used to extract the Baby from the water without dragging it (gasp) over the beach
Remember,
"The first rule of flying is that it is an expensive way to go somewhere that you can't afford to be once you are there."
You really can't control the first part of this, but you could the second with proper ground crew and trailer. BTW, can the Baby on its trailer clear bridges and be less than 8 feet wide?
What a wonderful wonderful project you are planning.
best, JF