it looks nice to be fair but not sure if it is worth £21000 / €27000 when GU81s are only €50 each – and most of the customers are going to be middle aged chaps who often cannot hear much over 10 KHz anyway.
if you are smart (and/or crazy) enough you could build a GU81 endstage for much less; which isn’t a particularly complex circuit although it requires two 2000 V trafos (of the sort used in microwave ovens) for the anode voltage – so not an ideal beginners project..
Die Anodenspannung von 3000 Volt ist nicht mehr nur lebensgefährlich sondern tödlich.
(rest of the site (auf Deutsch) is here – (it has a lot of good circuits and info ) elo.maanders
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