DX roller

I am starting to make a 3" Aveling DX roller after seeing one at a show a few years ago.

Does anyone know of any castings that have been produced for it?

I am sure this question has been asked before but I thought I would ask before making my own patterns. I did notice some great pictures of another engine on this web site (by Ian Hughes) .... I think it may even have been the engine at the show.

Or maybe even some original drawings from Aveling.

Any help would be great.

Thanks

Ken