How about building it from pine first to see if you like the dimensions etc, then build for good in hardwood?
I'm glad I didn't make one so far, as I wished to do the same...until I seen a utoober drop
a plane (IIRC) on the floor, he has ductile iron planes and mats, so came away unscathed
for the most part.
That's a true glimpse of the real world there, being focused on something else whilst doing the housekeeping.
My scavenged beer fridges have proved very handy behind me on the bench,
for easy placement of tools on a
big flat surface, and insulated aswell.
I just about managed to scoot them slightly closer behind me since, which was pleasing,
as you can see the tools are very far away in this pic.
Tools go back in fridge for metalwork, and admittedly is a pain to take them out, most in
Euro containers of various sizes, and frequently used things are left out when
woodworking, and have plenty of space to go from bench to fridge top, and back again,
so that's another factor of risk taken away IMO.
In short, I'd a surely want a horizontal surface under a cabinet if you want one, cuz you likely won't put them back without.
Likely won't require a re-design, but just some food for thought, should you be thinking of hanging things like saws from the bottom.
Tom