That's quite an ambitious project, looks good. I have a Velleman K-4000 I built around this time in 1997. It was probably the first one in the United States, as I waited a short time until they came out with a 120 volt version. Still annoys the neighbors. Four EL-34's per channel in PPP.
The amplifier forums are devoted to products of diytube, but you're welcome to post in the general area.
Hope the amp sounds as good as it looks !
... tom