I'm not sure how much of the available literature on human powered flight the OP has read, but Bryan Allen, the pilot of the Gossamer Condor and Gossamer Albatross flights, recommends THIS WEBSITE by Chris Roper, designer of 'Jupiter' as a "truly remarkable on-line resource."

Bryan Allen is currently at JPL in Pasadena and has a personal website HERE.

Here's a three-view of 'Daedalus', MIT's FAI record setting (74 miles in 3 hours, 54 minutes) HPA. Wingspan is 112 feet, and empty weight is only 70 pounds. Remarkable.