An excellent idea... one I've toyed with myself. Being able to walk up a sandy beach is pretty attractive. The
shallow draft, of a
multihull and ability to take the ground creates a potential of getting into a pickle.... Imagine going up to the beach to dry out, and making a mistake about tides... Being able to push yourself down the beach means that you don't have to worry about tidal range so much if you are working on the boat.
This is exactly the same as a procedure I've used many times to free a pickup stuck in snow or mud.... Raise it on a handyman jack, and push it off.... forward, backward, or sideways.... Simple and effective, and you can move a vehicle quite a way doing this. I call it "jacking off" ;-)
One of the big attractions of a
multihull.... just one of them, is the ability to take the ground. Many places have almost no tide, by contrast, Darwin can have a tidal range of as much as 20' at some times of year. The
Sea of Cortez, and the Bay of Fundy are also well known for their tidal range. That would allow quite a few hours to
work on the bottom.