How standardized are metal lathes?

Hi,
How standardized are metal lathes? Admittedly the one machine shop I use has 4 identical lathes, so I have little sampling.
For my rose engine, I am interested in making an existing lathe the foundation. If other people wanted to use it, it would be very cool if the same parts matched easily to any machine. But I just have no idea if many lathes have similar bed cross-sections, the most important thing.
For the rose engine I could use a rocking headstock (in which case, I hope that the rails of all beds are spaced as far apart so the same headstock is perfectly transferable). I would machine a new headstock that would simply be plopped on in front of the existing headstock and come with its own hand-crank. Or, I know that our ltahes have a whole bored all the way through the headstock, so parts can pass infinitely deep through the jaws. Do all lathes have this bore, and is it of the same diameter, standardized? I could mount the mechanism off the back of the headstock, which has been been done before, albeit in 1890.
As importantly as a standardized bed, are the t-slots in the carriages, by which the toolposts are held, standardized enough at least in width of the slot that I could make an addition that would easily bolt into the majority of metal lathe carriages?
Or with all the makes and models and manufacturers, and over decades (I'm sure that numerous lathes a century old are still in use), is it a hopeless mess, each lathe with its own slightly different bed, carriage t-slot, and headstock design, and I should give up now on every designing a universal accessory to metal lathes that relies on being compatible in the aforementioned manners? Will it simply have to be built to match the specific lathe in question, and redesigned and rebuilt if to be used for another, and again for a 3rd metal lathe?
thanks! -Bernard Arnest
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Metal lathes have been highly standardized for a long time. And there are literally dozens of standards to choose from! There are morse tapers, brown & sharp tapers, threaded spindle noses, tapered spindle noses ... you can even mix and match your standards! Most manufacturers do.
Bruce Bourg wrote:

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They are not.
John Martin
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