This is what I know. (Or, at least think I know.)

The Phil Kraft version is the original. (It is the RCM plan.)

The Jensen version is the first kit version. This one has a 60" wingspan. These two are nearly identical.

Midwest made a number of variants. They may have made a straight up Ugly Stick kit as well.

The Sweet Stick is slightly smaller and designed for a .40 engine instead of a .40-.60 engine. They also made a low wing version. By slightly smaller, I think it had a 56" wingspan. (Mine has about a 15" wingspan now, lol.)

The Sweet Stick plans are no longer available from Midwest, but they are on file at AMA, so you can order them there. (I had lost mine.)

Lazer Works also has short kits for some of the Midwest variants. I think I remember seeing the low wing version, which, I think, was called the Sweet and Low Stick.