Essentially this is a fixer upper for pp that know what they are doing, exactly like Dan said, buying one is like buying a classic old car - you may get some parts from secondary market at who knows what price, while others you will need to know how to fix.
Also this is a bit big for most home shops. I mean 70 amps 3ph is a lot of power. A LOT. Even supplying it with far less power then max needed, say 45 amps is around 25hp rotary at minimum running full power. Including losses that is more then 80 amps 1ph draw. Garage should have well over 100 amp supply, more like 200 amps. This not even considering space use.