There are plans for the original and the Jensen version all over the web. However, I believe a model worth building is worth paying for good plans.
The Phil Kraft version is plan #939 at the RCM plans store.
http://www.rcmmagazine.com/store/sto...LsxzEQJQE966r0
I chose the Jensen version available from Uncle Willie's Site:
(page 14, near the bottom)
http://www.myunclewillies.com/about1.html1.html
He has it available in a number of sizes.