This is the final photo !
Here you'll see the power regulators to get stabilized +/-15V for the opamps. I used standard 7815 and 7915 regulators for this purpose.

Whyyyyyy cannot the 7915 have ground as the tab/middle pin grrrrrrrr.... I had to isolate it from the chassis/heatsink.

I am quite surprised that the regulators stay cool, there's over 15 volt difference between input and output ! But maybe the heatsink is just too good hahahahaha.

This was a very very fun build, and I have another one already cooking which involves rebuilding the inners of one other fancy amp of mine so it will be much more awesome :D