Vintage Synth Repair

It is missing the bottom wood base and power supply, and looks in a 
very bad/old condition, but not like something that cannot be 
recovered ...

I'll start by asking whether making or purchasing a PS for it should be 
an issue ?.... can I use a PS from another old synth which can provide 
stable +5v, -5v, +15v, -15v ?

I got an old Polysix which is missing a working computer board, I can 
make it for parts and use its PS, could this work ?... 

Thanks !