That is not sure about planing ability but their are some boxy "jonbboats" from designers like Jim Michalak(?). Last sorry I does'nt have the cortect spelling of the name but you can find his designs at
www.duckworksmagazine.com. After all he actually has 1 called a "campjon". his designs tend to use Phil
Bogler's "birdseye" cabin and so could be on the heavy side. also whether you look under "gavrey" you can find small plywood boats whitch will pane with low power. they are generaly less boxy and have a bow like a toboggan. TF Jones shows how to build them in his two baotbuliding books.
usausly a sailboat has a narrower transom than a planing powerboat. Meanwhile I don't know how the tradeoff works.