This "tunnel boat" is real interesting

"In case you have never read about the boat, I?ll give you the specs:
It is twenty feet long and 76" wide. It is strip built out of tulip
poplar and is powered by a three cylinder Kubota Diesel tractor engine
rated at 20 hp. It will run 20 knots in six inches of water and gets
about 28.6 nautical miles per gallon of Diesel fuel running at its
most economical speed of 10.5 knots."
http://robbwhite.com/rescue.minor.html

Tolman started one, but look like he retired before he finished it.
http://www.fishyfish.com/renn_tolman/index.html

Seems a boat like this could be mass-produced in glass and find a
market with today's gas prices.
But maybe not.

--Vic