After studying the plans for the glockenspiel I decided that I wanted to
build the organ without the Glock to start with and have the ability to easily
add it later. To accomplish this I built an extra slider valve assembly like
the one used for the four rows of melody pipes on the top of the windchest,
and then glued this extra one to the bottom of the windchest.
The extra slider valve assembly has the pipe holes drilled facing forward
so that I can plug tubing onto the holes and then run them to the Glockenspiel.
Having a slider valve allows me to still play the organ if I take off the
glockenspiel and not have to plug off all the holes.