The West Mersea Duck Punt is a superb little boat that rows, paddles and sails well and which can be built over a couple of weekends for under £100.

Length: 16'
Beam: ~3'
Draft: ~2" (unladen)
Rig Type - Lug (Optimist

Photographs borrowed from sites below:

 

Duck Punt Films
duckpunt.wordpress.com
Drawings via here