I think it easy to design a plinth or multiple plinths that allows for interchanging tonearms, that is, to make all the plinths to be able to accept the same armboard or mounting mechanism. And that is a better idea to experiment or to play with different sound than to have a fixed plinth. A plinth might work well for one table but not for a different one. But keeping the tonearm and cartridge the constant can tell you a lot about turntable genres. People like to mess with plinths and platters, I prefer to swap out motors - in a belt-drive (or to a lesser extend, idler drive) turntable of course.
Have fun!
Have fun!