MOTM

Concerning backs:  I have planned to use a thin plywood (1/4") for the
back.  However, I plan to put mounting in the back for a 3U or 4U MOTM size
panel.  That panel "might" be a 900 power supply , or it might be a panel
drilled for a variety of other contraptions and connectors.

For example, my bottom cabinet will have a place for the AC cable to
connect on that panel, switched AC outlets so when I turn the bottom
cabinet on, the power supplies for cabinets 2, and 3 come on.  The magic
buss (tm) wiring will require some 1/4 phone jacks for inter-cabinet
connections.  In general, any backside connections will be on this panel. 
That way, they will be stationery and will not be effected by taking the
back on and off.

Larry H