In article ,
Sanders wrote:

You dont build boxes out of plywood or particleboard, for a proper
build, you build them out of MDF, preferably 3/4" or 1"

For home systems, the 1" MDF or HDF is best, but it is way to heavy to
move all the time. For a permenant install, the MDF would be fine. For
portability and strength, plywood is the only way to go.

As to particleboard, what do you think MDF is?

as for instals I really doubt you can get a" overhead use " sign off
for mfd without extreme internal steel structure
Never hang mfd boxes unless your using factory provided hang points
and hardware
George