Building your own HiFI rack (hasn't been discussed in a while)

I need a new HiFi rack and have to compromise with a partner who wants something that looks good and matches the furniture.  I prefer to build than buy.  My idea is to build something similar in concept to https://www.hifiracks.co.uk/collections/hi-fi-racks/products/podium-xl-v  with each shelf made of Cherry butcher block to match the rest of the furniture.

My questions are:

1. Where to get spike sets to put under the legs of each stand alone shelf i.e. recessed thread set into the wood and spikes to screw into them plus locking nuts

2. We live in a 200 year old farmhouse with a suspended (uneven) solid Oak floor. I can't use spikes so was looking at what kinds of feet to put under the bottom legs: neoprene isolation pads, sorbothane, or what?

Any help, pointers, or experience would be greatly appreciated.

Thanks,
Roger