Jennifer, my workbench is a simple frame of 2X4s and I use a 3/4" MDF top to a depth of 33 inches. The bench is 8' long and there is a 3" overhang at the front and sides. I added 4 spaced 2X4s to the back and added 3 full length adjustable shelves and some cross bracing at the back of the 2X4s to mount a bunch of surge protectors for the equipment. Everything plugs into a big UPS for protection. The MDF works fine but I also have an ESD mat across the entire width, 24" deep. There is also a shelf on a frame at the back underneath for additional storage.
Looking at your rendering, you could probably park a VW Bug on that
I find that 33" on the desktop and 12" on the shelves gives plenty of room for stuff and is easy to reach . I have long arms but I think 36" might be a bit too deep for me. Everything I have fits on the 12" shelves, the Tek 2235 scope hangs off the back a bit but isn't in danger of falling off. There is a thread on workbenches many pages long but I haven't the patience to search for it tonight.