This project is turning into a monster :)
Is the intention to be able to connect the regular TU-05 to this base for powering speakers or will this run independently?
Well if you can manage to fit those x2 rack server cases into one of those professional travel suitcases that pilots use with telescopic handle and wheels the sky is the limit.
80hs playback time would allow for at least one round-the-world trip......maybe it could be called the TU-05 Weltweit??
should be called "The One and Only", can't think of building a second or even larger one ..... maybe with anode voltage power supplies and batteries for each single tube ? :-)