Looking for any first-hand experience if anyone here has actually built one of these very tasty-looking little 1/2-watt amps from Guytronix.

I'm seriously considering building one and I'm just curious on a few points... how are the stock tubes supplied with the kit? Recommend upgrade? To what? And how about a speaker? I'm thinking of either a Celestion or Jensen 12", but not sure what would be best with a little low-power tube job like this.