I was fortunate enough to purchase a very nice workbench from another member on this forum that has temporarily replaced the need to make one. But I still find it enjoyable continuing my research on workbench designs and construction. After reading The Workbench Book by Scott Landis and part way into Workbenches by Christoper Schwarz I was surprised by the limited mention of materials other than wood being used. As an alternative to the traditional approach in making a workbench a YouTube video (link below) by Jeremy Schmidt describes using a concrete core wrapped in wood for the top. Comments? What about using steel in some parts of the workbench? How about some of the dense polymers available today for the top?
https://www.youtube.com/watch?v=wSJEy35J5vg&t=902s