This aluminum boat design (plan) is for a 11.6 meter  RIB.

At 9,932 lbs. displacement with 240 gallons of fuel, at (3) 225 HP, the boat obtained 40 knots during sea trials.

LOA	38' 0"/ 11.6 m
Beam	13' 4" / 4.1 m
Weight	6,756 lbs / 3,064 kg
Price	$18,900*

*The above price is for the construction plans and a onetime use of the CAD cutting files.

Hull 1867

Weight in table above is the weight of the uncut aluminum sheet and plate.

See this design in action

https://www.youtube.com/watch?v=yxCf8DUcx24&feature=youtu.be