Mapman, as to whether sitting on a solid foundation is enough... Build a giant steel-reinforced concrete cube platform - call it 100ft a side. Put an electron microscope on top of it - however the electron microscope is sitting on a piece of plywood which is suspended on top of a giant bowl of jello. Which will matter more to the electron microscope, if a man is tapping on the side of the concrete platform? or if someone is trying to break the bowl of jello with a jackhammer.
Re-plinthing a table is not difficult for those which are meant to be re-plinthed (Technics SP-10Mk2, Technics SP-10Mk3, the Denon DPs, the Sony TTS 6000 and 8000, the JVC TT-81 and 101, the Exclusive P10 (and probably the P3), the Pioneer PL70L (and lower models with the Stable Hanging Rotor system), and probably some of the Kenwoods, and probably the top Diatone). Some of the above area easier than others. In the worst case, you design the plinth and get someone to cut the wood for you. If you want to veneer it, watch a youtube video. Doing it really well on the other hand... I am not a furniture maker either, but some of the really nice plinths don't cost that much to have someone else build.
Re-plinthing a table is not difficult for those which are meant to be re-plinthed (Technics SP-10Mk2, Technics SP-10Mk3, the Denon DPs, the Sony TTS 6000 and 8000, the JVC TT-81 and 101, the Exclusive P10 (and probably the P3), the Pioneer PL70L (and lower models with the Stable Hanging Rotor system), and probably some of the Kenwoods, and probably the top Diatone). Some of the above area easier than others. In the worst case, you design the plinth and get someone to cut the wood for you. If you want to veneer it, watch a youtube video. Doing it really well on the other hand... I am not a furniture maker either, but some of the really nice plinths don't cost that much to have someone else build.