I didn't remove the rear panel. I added corner round molding in all 12 corners and 3x1 cross braces through the woofer openings.
The speakers in the last picture are Tyler Acoutis Linbrook signature series.
I kept the KLF-30, C-7, & KSP-S6's/B&W asw-850 15" sub for my 5.1 home theater and updated my
2 channel system to:
Home theater PC with 2T of lossless ripped cd's and high def,
Bolder Cable modded EE Minimax tubed DAC,
Modwright tubed pre-amp,
Bryston 7B-ST monoblock amps, &
Tyler Acoustic Linbrook Signature system. (with M&K MX-5000-mkii sub crossed over at 50hz although it really doesn't need it! LOL)