Castlewood busker organ

Rather taken with Castlewood = 20 note (which notes?) (MIDI file on site). 375mm (15″) wide x 300mm (12″) high x 290mm (11.5″) deep – ie wee bit bigger than my Dell opened up. Photos of kit & construction. 2008/6/16 complete kit price 1420AUS = 860EUR, possibly plus 3.2% European tariff. US 810€inc PP Profile of the maker. Re friend: “Eventually he built the world’s first computer controlled punch for making organ roll music.” Can I MIDIfy it? Could I stack a laptop under it?