Davy there is a picture part way down the following page. Not the most attractive of portables. Looks a bit like the early Seeking portables
http://modelengineeringwebsite.com/Fabrication.html
Potty as you can see from the above the Sissons can be done by fabrication, you don't really need castings. But Graham at Brunell Steam models is supposed to have patterns, try your luck with him.
Have a look at this thread on HMEM as well
http://www.homemodelenginemachinist....?topic=16772.0
J