Don't forget, once you install caps and plug it in... it is still capable of giving you an "experience" if you don't discharge the caps and you touch the wrong thing. I don't know your experience but the best advice is to (not literally, but almost) keep one hand in your pocket). I've been shocked once building amps, it's all it took.
I love building single ended amps.. I don't design, but there is nothing more rewarding or more frustrating as building an amp. Sometimes mine sound great, but now and then I build one that will not work no matter what I do. Oh well, I'm almost done with a FrankenTweed Deluxe, it has a Bandmaster OT. It should rock. I was going to use a zener diode to lower the voltage but, heck with that.. I don't need to lower the voltage, I need more voltage, roight? Tubes are cheap!
J