Just a side note: Personally, I have seen instances of all four styles shown above. For instance:
- Style #1: Bevelish Creations’ Drill Press Stand https://youtu.be/-tQlfUkJ6iU?si=XPuFCNYPbhfR5Y9_ . There are countless other projects on YouTube that also use a continuous sheet of plywood for the bottom, but use casters underneath that as though they were feet, such as  Fix This Build That’s Flip Top Tool Cart https://youtu.be/QCcCAKLb5Ww?si=j88BH10c52pJ_ZN1
- Style #2: Rings Workshop Flip Top Workbench https://youtu.be/c_Zipc9MGmo?si=rccEHCEZ2JzI79i_and April Wilkerson’s lathe stand https://youtu.be/DMJS-oRKCtY?si=4OtbMl6kH9orHA7-
- Style #3: There are far too many examples of this to count, but one of the first ones that popped up was Scott Walsh’s workbench: https://youtu.be/MviF3g0UCdE?si=WWxCt_msc1f92GaF
- Style #4: Can be seen in many prebuilt workbenches, like the Sjobergs ones: https://www.highlandwoodworking.com/sjobergs-workbench-elite-with-drawer-cabinet.aspx