Some observations and guesses:

At first I thought it might be a "goat" (FF model converted to CL), but the construction appears too heavy for FF. Note the strength built into the landing gear, and how firmly it's mounted. Also the firm engine mounting.

My GUESS is that it is either a CL or RC Scale...because of the doors, if it IS a kit. It may have been built from scratch, using a three-view or other plan as a guide.

George

Edit: Additional thought. Many of the plans offered by AMA are from John Pond's dream of not letting the old models fade away. I understand that some of the plans are not offered because they are available from another source. Perhaps a note or call to the AMA would yield some info about who would offer the plans you are looking for.