There is college student in Japan who have built own Prophet 5 (Patreon)

In Japan, the Prophet 5 is the most popular analog synthesizer.

The reason is that Ryuichi Sakamoto used to use it. In the past, Ryuichi Sakamoto belonged to the band Yellow Magic Orchestra (YMO), which is 40 years old, but is still very popular.

https://www.youtube.com/watch?v=66cR64sJ-Ew 

The student who made his own Prophet 5.

It is 4-note polyphonic, but the tone is reproduced very well.

His YouTube channel has videos of the YMO band playing and some homemade synthesizers.That includes Analog 2.0.

https://fabcross.jp/interview/20200717_prophet.html