This is where I am at with mine.
The power distribution block.
Using a 5V linear regulator and the MAX1044 charge pump,
Input 9V via barrel plug ...
Outputs -9, 0, 4. 5, 5, 9 and 18V
-9, 4.5 and 18 taps will service the analog TL072 based input and output buffers. With 13.5+/- to operate in, it will have plenty of clean headroom and ample capacity for boost similar to the fabled Klon Centaur.
0 and 5V taps will serve the digital segment consisting of course, of PT2399's and eventually a PIC16F functioning as the nerve center at some point in development ... not this week however.
The remaining 9V tap will likely be omitted in this project.
Bench tested and confirmed operational.