As stated previously I believe what you have is a box of odds and ends.
I am quite sure in the light of the further pics posted that the cylinders are Clackson/Jackson castings for the 3.5"g SR Lord Nelson. This design is extrememly rare.
The wheel castings – some might be for the above for the tender and front bogie, but not the driving wheels.
I have a 4 cylindered Jackson 3.5"g GWR King. The drawings are very very difficult. I would not recommend any of the Jackson/Clarkson designs unless you are a masochist or know a great deal about the fullsize example being attempted in miniature.
The abscence of the middle inside cylinder block for the Lord Nelson again suggests this is a box of odds and ends.
Cheers,
Julian