I have just spotted this post several months later. I do intend to have the drawings available but not until the engine is finished and running which may be sometime in 2014. I would point out that there are a number of very intricate aluminium castings required for which I have all the tooling mostly in the form of silicone rubber patterns and moulds. The actual casting is best done by specialist foundries.
Before finishing the drawings I would like to have some idea of how much interest, if any, there might be out there in reproducing this fine historic engine in 1/3. I might be able to assist with the production of waxes but do have a full time job to see to as well!
All enquiries are welcome and I should be pleased to discuss this project with anyone seriously considering it.
Stephen Wessel