Update
So I've updated my design a bit to incorporate the table-top idea right into the main drawer itself (based on all the feedback here, I decided against placing it in the wing, but at the same time I was convinced I wanted the functionality.) The challenge was to do this while minimizing the loss of space and usability in the main drawer.
So the new implementation is very simple. I've basically placed a 1/2" plywood sheet with a dado cut that can be layed on top of the drawer as it is open, which then turns the entire drawer into a big table. When not in use, it sits on two aluminum L' brackets that have been inlayed into sides of the box (see images below.) So in normal use, you can pull the drawer out and not see the table top in any way, but in case you need it, then you pull it out and it locks in place on top of the open drawer.
Plan is to inlay some cutting board material on part of the "table top" too to make it an instant cutting board as well.
I've already build much of it, so this is the plan for now (no going back...) I'll let you know how it turns out in practice.
Image below shows how the foot-print matches the top of the drawer:
...I also decided to build a mini cubicle on top-of the lock cover to try to find some functional use for the otherwise lost space (It's removable too if you want to use it as a temporary holder for screws/bolts, etc.) In practice, I figure it will be a good place to keep the keys for the drawer, so this way they are ready at hand in case I want to lock it. (it's not actually glued together yet in the picture, just trying out the parts)
Getting the staggered sides to work has proven quite a bit of extra effort, but it's finally coming together.