This DIY-er found a boat he liked in the PopSci archives. Then he built it.
Homemade Houseboats - enjoying a great home built pontoon boat
Pontoons and floating systems - floats and floating platforms
5 Simple Steps to Build Your Own Custom Pontoon Boat – Better Boat
Tinypontoonboats.com - 603-630-5658 - plastic pontoons and frame kits for building boats, rafts, work barges, dredges, robots, USV vessels, and house boats
Make a DIY Pontoon Boat in 1 Day for $250 Bucks! – Pontoon Depot
Amazon.com: Green Blob Outdoors Pimp My Pontoon LED Boat Deck Lighting Kit with Bonus Red & Green Navigation Lights DIY Pontoon Under Deck Lighting kit for Pontoon Boats (Green, 20) : Sports
BUILDING a HOMEMADE Pontoon Boat!!! (Will It SINK!?) - Part 2 - YouTube