BUILDING HIS OWN PIPE ORGAN ?
Building computer-controlled Pipe Organs is very much easier than building trackers.
You don't need complex machanical parts, but only magnets which are directly linked to a
direct power interface. This power interface is linked to a PC.
Not so difficult!

For an electronic tracker control (stops and notes)
You need:

ITEM	SUPPLIER (fournisseur)	COMMENTS	AVERAGE PRICE
Pump (ventilateur)	Available by different Companies Contact P. Leray	See picture	1500 € for a 10 stop pipe organ
Regulator	yourself	See picture
Porte-vents	yourself	simple boxes which transmit air pressure to the bodies	can be done quite simply.or use plastic pipes
keyboards (claviers)	MIDI keyboards or organ builders	Can be purchased everywhere; authentic pipe organ keyboards are more expensive	150 € for a MIDI keyboard; 700 € for a mechanical or electrical pipe organ keyboard
bodies (sommiers)	yourself	Electrical bodies are quite simple: just a box with holes, and magnets to  be  put  under  the table See pictures Sommier détail de construction
Pipes	ancient pipes, or yourself for wood pipes	Type de Tuyaux Coupe d'un tuyau en bois Dimensions available contact me	Jeux de fonds Anches
Magnets	Available: contact: pascalleray.ftrd@free.fr	See theoretical picture See magnet examples	Very various prices!
ELECTRONIC CONTROL	contact: pascalleray.ftrd@free.fr	See pictures	From 3000 € for a 5 stops organ, up to 10000 € for a large one (100 stops and more)

You have after to build a nice case!
Price depends on your technical skill.