It does sound like someone removed the sustain pedal pneumatic and the
soft bass/soft treble pneumatics from Leonardo Forti's piano described 
in the 18.04.08 MMD.  These could be reproduced.  The hardest part would 
be the valving, and you could use something like a Wurlitzer valve block 
to save milling a valve unit.  

The three buttons Leonardo mentioned were the controls for soft bass, soft
treble, and sustain.  You get to decide which one is which at this point! 
Some clues may still be visible.  Look under your keybed for some large 
staples which would have held the tubing from the buttons to the sides of 
the piano.  This will reveal the tubing routing and might even tell you
which buttons did what. 

Look at your piano action at each end for a connection to lift rails in 
the hammer-rest rail.  The amount of movement these take to bring the 
hammers to the soft-play point gives you the span of the missing pneumatics, 
usually connected by a stiff wire, threaded on at least one end for leather 
nuts for adjustment.

Good luck!

David Dewey