Slots for wire and tube routing were cut out of the top and bottom shelves. I attempted to use a pattern router bit, but the deep cut forced the bit's bearing into the 3/8-inch thick particle board, ruining it.
So I switched to using a pattern to guide the base of the router.
The slots along the edge of the bottom shelf were cut in such a way to allow tubing and wiring to pass without significantly weakening the 1/2 x 1-inch u-channel.
Bottom shelf slots:
Top shelf slots:
Finally, two slots were also cut out of a portion of the "false" back: