"Puckdropper" wrote:

I'm working on building a simple entertainment center, and would
like
some advice.

High on your list of design requirements should be heat dissipation.

Putting electronic packages into an entertainment center with a closed
back should be avoided if at all possible.

As far as board length is concerned, have never found any requirements
for hardwood boards used for furniture much over 48"-54" long. YMMV

Have fun.

Lew