Getting there. Looks like a few of those will be able to be DIY. You'll have to do the 4 gates -> 1 trigger/gate with the nw2s!

 


Looks good! But it would be better named "Cheap 'Paraphonic' Modular", as there is only one filter/envelope; true polyphony requires that each oscillator (or group of oscs sharing the same 1V/Octave CV) has its own filter/envelope/amplifier in the audio path.