Two large general arrangement drawings of the early design of Switchback in 3/8″ and 3/4″ but easily scaled to 1/24th or larger scales.
I also have scans of a number of original Savage drawings of this ride which I can make available to prospective builders.

1888 SAVAGE SPINNING TOP SWITCHBACK DRAWINGS – MFD20 – £29.

Not built a model like this using plans and instructions before?  Then take at look at what is involved – BUILDING MODELS FROM PLANS