The model is scaled to fit the printer.
The base size of the chair would actually be 190 mm x 395 mm
I am going to mount it on a sleeper and will print some chair bolts to suit. If any one needs the model let me know.#
The chair is modelled on a 11-1948 version which i found in our local Steam museum and the rail is a BS-95R Bullhead. The key is a standard rail key of that year.
The rail and chair do not require a raft.
The spring will require a raft.