I like the design. Looks like it will give you a lot of storage plus some good strength. 80/20 is really great stuff. I drew my drawing in Sketchup like you and then sent it to the 80/20 rep for his refinements and quoting. Worked great to go back and forth that way.
Here's an 80/20 bench I made for Systainers and other items. Might give you some ideas.
- The upper shelf uses 80/20 back rails with extra standoffs to extend around the overlay top. I like having the upper shelf so I don't have to bend down for every item. Most of the overhead Systainers actually go to a destination - like router bits to the CMS or the Vecturo being used away from the shop.
- The sortainers have a strip across the back to hold them in place and keep them from sliding. There is space behind them for seldom used tools.
- I did a vise on the end with the top offset to provide clearance and the wheels lock giving me a very sturdy bench
- Bottom shelf is for 'future purchases'
- I got the heavy maple top at Woodcraft. I have a couple of other tables drilled for 20mm holes and clamping
- The plywood shelves were finished with acrylic poly and dropped in place to fit between the posts during assembly. Looks like you are capturing yours in the 80/20 rails. I wanted mine to allow full access rather than having the rail extend above them, reducing access from the edge. [size=78%]They are all screwed down to T-nuts captured in the 80/20[/size]
- You can't see it but I captured a power strip on the side rails on the left side with T-Nuts for easy power.
I debated doing pull out shelves but I have the full Systainer port to the left and several other pull out storage units in the shop.
Might give you some ideas.