I bought a set of castings from Les Chenery before he produced his plan. The set I bought was his spare set from his prototype model. There was never as far as I am aware a construction series for this model, however Strictly IC ran several construction articles on very similar engines which I used to construct my model which is now 90% finished. These articles are still available on the Strictly IC web site. Also have a look at http://www.modelenginenews.org