Inquiry about spec. of power transformer

Hi Guys,I need your educated opinion -I got the enclosed scheme of a nice tube amplifiers and I want to build it,but I can't figure out what should be the asking specifications of the power transformer-could anyone share with me this information ? Thanks for your willingness and efforts to assist me.
 

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This is an 800 Volt amplifier. I would be very afraid. And I would think that if you were experienced enough to work on it and survive, that you could also compile the transformer spec from data on the plan.
 
That would be a very expensive first project. WE 437A and probably transformers from Tango. A lot of these designs from Japan all seem to use custom power transformers. You know nobody stocks anything even remotely close to that.