Maybe a rare post but I like to share the upgrade of my avant 28" to a 50" plasma π
Take out the tube and other electronics. Make "some" inside modifications. I used the existing audio amplifiers. For that adding a power unit. A Sony Blu Ray 350 player perfect fits in line with the earlier VHS envelope. Above of that the mediabox, now located behind the textile frame. You have to cut out the plastic in line with the mediabox it's lcd and IR receiver. Since the textile is little transparent you see the LCD and lights of it behind.
I used the original Avant speakers and amplifiers but not the plastic cabinet. Adding panels and the original bass reflex tube inside the frame its self at the same location. Dont forget to activate the mute on the amplifiers with a 220 k resitor from a 9 volt location otherwise you will not get a signal.
If you need more details let me know. If possible I will provide. Summarised its quite a project in advance a lot of pleasure.
Regards Hans The Netherlands