I received the parts I needed to continue the bitx 20 project. What I was mostly waiting for was more diodes for the mixer and a suitable RF transistor. The schematic calls for a 2SC2570A for the RF amplifier section, but I couldn’t find one. Looking at the datasheets, the KSP10 looked to be a good match, so I picked up a few of those. The rest is just following the schematic. I’ll be using an arduino/si5351 vfo, so I will just pipe the vfo signal straight into T1.