I have some plans for a three wheel recumbent. A good website to go to is http://www.ihpva.org/com/PracticalIn...ons/index.html . If it takes two people to lift it then its probably to heavy. I would only use the front steering section because thats the most fiddley part to make. build the rest of the frame and just take parts off the old one. Personally id go for the tadpole design because i use them the most and they're pretty stable.

Hope that helps
Racer