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1. Don´t install the header as described at the beginning of the build - otherwise you run in trouble ( normally is the process: put the male and female header together, put it on one board and use spacers and screws to hold this in correct place/alignment,

then solder the male/female header. this is the only way to get a correct alignment of the pcbs and frontpanel.

2. solder the 4x TL1963 and lm2991 not to close together - or you risk a short between the solder points or regulators.

3. use matched transistor pairs as described in the buildguide, but from my pov. you cant match a 2N3904 and 2N3906 to the same value.

make sure you installed a jumper on JP10(2pins)  and JP19 (3pins) (bridge the second and third pin with a PC jumper)