Okay, my buddy and I have commenced the 5C3 build. The way it's working is that he is doing all of the work while I stand over his shoulder and annoy the bejezuz out of him. We fabricated a chassis out of .040 aluminium and that came out rather well for his first go at metal work. All of the little bits are good quality, but I got my hands on some very cheap transformers. I think the OT will work perfectly in this amp, but it's gonna be suck it and see with the PT, which came out of an old oscilloscope. the oval mounting holes and extra access holes for the PT are to provide for a proper transformer in the event that the intended one turns out to be a failure. We're in the process of doing the eyelet board now. I'll post some pics as and when. Please, please, if anyone has any tips or sees that we're doing anything stupid, by all means, pipe up!