If you go to Bob, ask for the 1:5 scale (82" span) Jerry Bates' plan -- it's the "B" model. Bob can also provide the laser-cut parts for this one. Plan is $40. See:
http://bhplans.com/mrch8/jbpg2.htm
Bill Northrop also has the "B" model plan at a slightly smaller 1:5.6 scale (80.5" span), as seen in the June 1981 issue of Model Builder...by Col. Art Johnson. Contact Bill at:
Bill Northrop's Plans Service, 2019 Doral Court, Henderson NV 89014-1075.
PH (702) 896-2162 M-F 10A-5P, Pacific; FAX (702) 897-7775 any time.
Best...
pj