I see 12V+ and 12V- at the bottom of the board.
Where is the Power Zero Volts connection?
Where is the low loop area for the return current that MUST return to the Power Supply?
It looks a little messy..?
I'm also trying to build one of these.Still I couldn't decide The ground arrangement.
Maybe it is not so important For low power amps..?
When you look at TA8207 datasheet,you can see much clean pcb example..