Ray,
If you look closely you will see that other than the base, side rails, cylinder and piston almost every part of the engine has been redesigned. I've managed to get access to a laptop with Solidworks loaded so will be able to export the drawings I have as DXF's. Will try to upload these in the next day or so.
A word of caution though - as I explained above the drawings are basic and some of the features (spark plug adapter) will need further explanation to make sense to you,
Mike