Hi,
I've fixed the schematic link on my website now, the image got corrupted!
The PCB is 85x65mm and I have one or two available if you are interested.
You can not tap the audio directly from Paula, best to connect from pins 1 & 7 of U15 (LF347/TL084) but if you tap off the audio here you will need 22uF capacitors to block the DC content of the amplifier.
Have fun.
Ian