This is 6V6 amplifier schematic. I used the standard 40% screen grid tap, but the 6V6 is supposed to be designed for 23% screen grid taps in ultralinear mode. See my Audionote Kit 4 clone where I used output transformers with 23% ultraliner taps.
The chassis is a standard Hammond aluminum chassis. After gathering your components you can layout the chassis by leaving the protective peel off plastic on. I use a fine tip permanent marker to layout the holes. You can mark your holes for drilling with a spring loaded center punch. I make the larger holes with a vintage radio punch set which does a nice job on the transformer wiring holes and tube socket holes. And yes on this one the boards are not removable because I used chassis mounted sockets then soldered the boards to the sockets. I doubt that they would ever need to be removed as all the components are accessible on the boards. Just something I tried.
This is an inside view of the chassis. To the right is the power supply. hard to believe that I built this back in 2014. Time flies!