As an update to the previous post, here’re photos of the machined and loaded panels.

Front panel

The front panel holds, from left to right, the power switch, 4 LED indicators (+15V, +12V, -12V and +9V), two filter bypass switches and two output level pots.

Rear panel

The rear panel holds, from left to right, stereo audio inputs (unbalanced), stereo audio outputs (balanced), power output connectors (two for the +9V supply and one for the +12V), power input connector (+15V DC).