It’s time to get out those old hippie mags that were published back in the ‘60s.
I can’t quite remember what things they gave instructions on how to build.....
"In the early 1980s, the MOTHER EARTH NEWS staff experimented with the wood gas concept to power a truck. They eventually produced a wood gasification system, fabricated from recycled water heaters, that was successful enough to warrant a wood gas generator plan to offer in the magazine."
http://www.motherearthnews.com/shopping/detail.aspx?itemnumber=762