I'm running low on boards now (another neonixe member has requested 2). If you already have 7971 tubes in your possession, and you have a lot of experience assembling & debugging surface-mount boards I might be persuaded to release 2 more boards for cost-of-shipping from US to the UK. We can discuss more offline; check your inbox for my email address.
I use individual pin-holders (socket-pins), not sockets. After I place a 3D-printed collar around the socket pins, it looks like a socket. Each tube is assigned to a PCB location, and custom-fitted, which minimizes stress on the pins. I've ranted about this before on other threads; apologies for sounding redundant :-O .