Best Way to Countersink Holes/Make Screws Flush With the Metal

Wait what are shoulder screws?

This is a shoulder screw, and I don’t think it would help make your tray smoother.

Don’t countersink holes on your tray. Aluminum is thin enough and will rip right out once you put force on those screws.

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If you use c channels instead of angles you can hid almost all of your screwheads, you just need polycarb for the back of the tray.

I dont find that to be necessarily true. My tray is made from c channel with lexan on the back and there’s quite a bit of screws studding the inside.
Thank goodness vex gave the cubes chamfered edges