I would avoid this path for the reasons mentioned. After owning some high-powered tube monoblocks and dealing with tubes melting down, the cost of tube replacement, repairs, etc. I would go solid state for amps and have the tubes in your preamp and phono stage.
One conversation that sticks in my mind is one I had with a builder of some really great tube phono stages and preamps. I asked him why he didn't also build tube amps and his reply was "I don't want to be in the repair business".