I have also built a lamington 15 watt amp several years ago. It is a great little amp and quite loud.

I sourced my own parts including using cheap variations of several of the valves - e.g. 6n2p (I think) instead of 12ax7

If anyone is in the Blacktown area I still have a fair few of the transformers power transformers which I bought from dick smith as they were getting out of electronics - and the output transformers.