Just chipping in to agree with others above - this looks grand, and I really like your v2 faceplate. I find it easier to parse than the 500-series Helios, somehow.
I’m curious as to which direction you went on the gain control in the end - did you use a two gang switch to expand the headroom, or something else? Edit: Just noticed the “Boost” button, is that the trick?
I also note a screw hole in the bottom right corner of the main PCB, are you considering an L-bracket to strengthen the module? With that much iron on it, I guess it may need it!
Great work. Can’t wait to see the finished product.
Andy