Note: I am NOT one of these guys who can draw a schematic for a particular tube on a napkin while sitting at the bar having a beer. I'm getting there, but not quite there yet. I have completed most of the SP14 build in under 8 hours. If I get hung up waiting for the rest of the stuff, I'll go ahead and begin (and probably complete) the PH15 in the meantime. I was warned that Roy does not provide detailed instructions for these kits, but he does provide detailed schematics. If you can read a schematic, you're fine. If you're like me, you'll lay out all of the parts, install the ones you are familiar with and figure the rest out from there. If you have any sort of electrical or RF background, you should be good. If not, then you are one of the guys who should just let Roy build it from the get go!
BTW, I'm using an old Radio Shack soldering iron from the late '60's to do all of this. Yes, I did just want to rub it in!!!