I am new to the forum but have built several amps / projects over the years. I am currently in progress with my ST-120 build. Only changes I made were painting the transformers and adding an IEC "dongle" for the power cord.
The kit is packaged very well and the instructions are excellent. Only issues I had is the chassid was scratched up because it really isn't packaged properly and I didn't dig the power "lamp cord" even though I understand that was how it was originally done.
Hopefully I will have time to finish it in the next few days.