Strictly speaking, I think the Kaneta plinth was designed for the mk2 and not the mk3. The two chassis’ present distinctly different issues, because the mk2 is larger below the surface and houses all the electronics. Thus re-plinthing, if you want to separate the motor from the electronics, requires also that you build a box for the latter. The mk3 is actually easier to upgrade in that regard; the motor is fairly easy to remove from the small round housing found below the visible upper surface of a mk3. For my mk3, I commissioned a large heavy slate that houses the OEM assembly. Below that I installed a bearing damper a la Porter. And below that a substantial solid cherrywood base that bolts to the slate. IOW, I elected not to follow Dobbins’ idea, although I greatly admire his work. I succeeded in making my mk3 so heavy that I cannot lift it without assistance. I’ve also done the Krebs mod, and I’ve upgraded the chip a la JP Jones. I’m done.
Rich, if you want to use slate and if you opt not to do the Dobbins mod, I can offer some guidance. I think I still have the pdf file that was used to program the water jet to cut the slate.